diff --git a/1984/Makefile b/1984/Makefile
index 78aeedebd..3177eb0fd 100644
--- a/1984/Makefile
+++ b/1984/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1984/anonymous/Makefile b/1984/anonymous/Makefile
index 960fb8a46..4089386b8 100644
--- a/1984/anonymous/Makefile
+++ b/1984/anonymous/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1984/decot/Makefile b/1984/decot/Makefile
index f391da723..d0227e93c 100644
--- a/1984/decot/Makefile
+++ b/1984/decot/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1984/laman/Makefile b/1984/laman/Makefile
index a2c5f193c..146995282 100644
--- a/1984/laman/Makefile
+++ b/1984/laman/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1984/mullender/Makefile b/1984/mullender/Makefile
index 3ac7d5d80..97dbe4987 100644
--- a/1984/mullender/Makefile
+++ b/1984/mullender/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1985/Makefile b/1985/Makefile
index e6de36f14..2d9527468 100644
--- a/1985/Makefile
+++ b/1985/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1985/applin/Makefile b/1985/applin/Makefile
index 1bfbdd1b3..fb757ebaa 100644
--- a/1985/applin/Makefile
+++ b/1985/applin/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1985/august/Makefile b/1985/august/Makefile
index e2977af26..db3976402 100644
--- a/1985/august/Makefile
+++ b/1985/august/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1985/lycklama/Makefile b/1985/lycklama/Makefile
index 09394cb0d..e2b74380b 100644
--- a/1985/lycklama/Makefile
+++ b/1985/lycklama/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1985/shapiro/Makefile b/1985/shapiro/Makefile
index 138b75293..57071921d 100644
--- a/1985/shapiro/Makefile
+++ b/1985/shapiro/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1985/sicherman/Makefile b/1985/sicherman/Makefile
index 316ef68c8..f5f43bd78 100644
--- a/1985/sicherman/Makefile
+++ b/1985/sicherman/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/Makefile b/1986/Makefile
index 31addf125..48725a1d6 100644
--- a/1986/Makefile
+++ b/1986/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1986/applin/Makefile b/1986/applin/Makefile
index b6ecbd20a..32b07dc42 100644
--- a/1986/applin/Makefile
+++ b/1986/applin/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/august/Makefile b/1986/august/Makefile
index 9060b1c01..283e66faf 100644
--- a/1986/august/Makefile
+++ b/1986/august/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/bright/Makefile b/1986/bright/Makefile
index bcd4491f9..2812b7a05 100644
--- a/1986/bright/Makefile
+++ b/1986/bright/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/hague/Makefile b/1986/hague/Makefile
index c42a3a889..eb2aa2d5c 100644
--- a/1986/hague/Makefile
+++ b/1986/hague/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/holloway/Makefile b/1986/holloway/Makefile
index 31ddaefdd..351e0f8bd 100644
--- a/1986/holloway/Makefile
+++ b/1986/holloway/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/marshall/Makefile b/1986/marshall/Makefile
index 13ac7b81f..869481ebb 100644
--- a/1986/marshall/Makefile
+++ b/1986/marshall/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/pawka/Makefile b/1986/pawka/Makefile
index 2d7448788..99483c0ec 100644
--- a/1986/pawka/Makefile
+++ b/1986/pawka/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/stein/Makefile b/1986/stein/Makefile
index 7a96909b8..650e8a894 100644
--- a/1986/stein/Makefile
+++ b/1986/stein/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1986/wall/Makefile b/1986/wall/Makefile
index 41b59c254..917e87929 100644
--- a/1986/wall/Makefile
+++ b/1986/wall/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/Makefile b/1987/Makefile
index 4cf6b861f..e9512ca15 100644
--- a/1987/Makefile
+++ b/1987/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1987/biggar/Makefile b/1987/biggar/Makefile
index 287c41612..a58edc661 100644
--- a/1987/biggar/Makefile
+++ b/1987/biggar/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/heckbert/Makefile b/1987/heckbert/Makefile
index 24d0ab9ca..86f221508 100644
--- a/1987/heckbert/Makefile
+++ b/1987/heckbert/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/hines/Makefile b/1987/hines/Makefile
index 9c3cfa5d1..992ba4814 100644
--- a/1987/hines/Makefile
+++ b/1987/hines/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/korn/Makefile b/1987/korn/Makefile
index 71c77e7b1..4caca467c 100644
--- a/1987/korn/Makefile
+++ b/1987/korn/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/lievaart/Makefile b/1987/lievaart/Makefile
index 686e169c1..bb8da16f0 100644
--- a/1987/lievaart/Makefile
+++ b/1987/lievaart/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/wall/Makefile b/1987/wall/Makefile
index c2f9e18b4..ddf85b188 100644
--- a/1987/wall/Makefile
+++ b/1987/wall/Makefile
@@ -197,6 +197,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1987/westley/Makefile b/1987/westley/Makefile
index dae3318f0..62bc8f46b 100644
--- a/1987/westley/Makefile
+++ b/1987/westley/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/Makefile b/1988/Makefile
index f610ccf21..70e396e8f 100644
--- a/1988/Makefile
+++ b/1988/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1988/applin/Makefile b/1988/applin/Makefile
index 4c2d13a0e..a1d244a6f 100644
--- a/1988/applin/Makefile
+++ b/1988/applin/Makefile
@@ -207,6 +207,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/dale/Makefile b/1988/dale/Makefile
index 52a94cc75..7353cddd9 100644
--- a/1988/dale/Makefile
+++ b/1988/dale/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/isaak/Makefile b/1988/isaak/Makefile
index cec10b716..f315c64c3 100644
--- a/1988/isaak/Makefile
+++ b/1988/isaak/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/litmaath/Makefile b/1988/litmaath/Makefile
index 1282c29ed..ef4a4ce52 100644
--- a/1988/litmaath/Makefile
+++ b/1988/litmaath/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/phillipps/Makefile b/1988/phillipps/Makefile
index 05357ee11..6af5c0a56 100644
--- a/1988/phillipps/Makefile
+++ b/1988/phillipps/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/reddy/Makefile b/1988/reddy/Makefile
index d358e5bfe..e1e27e062 100644
--- a/1988/reddy/Makefile
+++ b/1988/reddy/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/robison/Makefile b/1988/robison/Makefile
index ab4e53112..d58a5ac19 100644
--- a/1988/robison/Makefile
+++ b/1988/robison/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/spinellis/Makefile b/1988/spinellis/Makefile
index d8afb4b8b..e3207fc42 100644
--- a/1988/spinellis/Makefile
+++ b/1988/spinellis/Makefile
@@ -231,6 +231,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1988/westley/Makefile b/1988/westley/Makefile
index 52d5e85f1..8107d9ce9 100644
--- a/1988/westley/Makefile
+++ b/1988/westley/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/Makefile b/1989/Makefile
index 0a01df6c6..966fbf925 100644
--- a/1989/Makefile
+++ b/1989/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1989/fubar/Makefile b/1989/fubar/Makefile
index 5f541ec26..122352226 100644
--- a/1989/fubar/Makefile
+++ b/1989/fubar/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/jar.1/Makefile b/1989/jar.1/Makefile
index a383e2e19..c668bda84 100644
--- a/1989/jar.1/Makefile
+++ b/1989/jar.1/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/jar.2/Makefile b/1989/jar.2/Makefile
index 22e0a4315..25022e95f 100644
--- a/1989/jar.2/Makefile
+++ b/1989/jar.2/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/ovdluhe/Makefile b/1989/ovdluhe/Makefile
index fd8cfb68d..73910cea0 100644
--- a/1989/ovdluhe/Makefile
+++ b/1989/ovdluhe/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/paul/Makefile b/1989/paul/Makefile
index 67e4fa8e0..65297eccb 100644
--- a/1989/paul/Makefile
+++ b/1989/paul/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/robison/Makefile b/1989/robison/Makefile
index 73617d9c2..445e88ce3 100644
--- a/1989/robison/Makefile
+++ b/1989/robison/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/roemer/Makefile b/1989/roemer/Makefile
index b3afa0cdf..1a40ee4d0 100644
--- a/1989/roemer/Makefile
+++ b/1989/roemer/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/tromp/Makefile b/1989/tromp/Makefile
index 54d06ba24..e8bf83f0d 100644
--- a/1989/tromp/Makefile
+++ b/1989/tromp/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/vanb/Makefile b/1989/vanb/Makefile
index 87e3e1fb9..af4a32f34 100644
--- a/1989/vanb/Makefile
+++ b/1989/vanb/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1989/westley/Makefile b/1989/westley/Makefile
index abe3d50c9..275393971 100644
--- a/1989/westley/Makefile
+++ b/1989/westley/Makefile
@@ -205,6 +205,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/Makefile b/1990/Makefile
index 6d2c9be96..fb240e8d3 100644
--- a/1990/Makefile
+++ b/1990/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1990/baruch/Makefile b/1990/baruch/Makefile
index a44f161aa..61951a80d 100644
--- a/1990/baruch/Makefile
+++ b/1990/baruch/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/cmills/Makefile b/1990/cmills/Makefile
index 8552f5027..3efb58da2 100644
--- a/1990/cmills/Makefile
+++ b/1990/cmills/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/dds/Makefile b/1990/dds/Makefile
index 0054f855b..4db286cb5 100644
--- a/1990/dds/Makefile
+++ b/1990/dds/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/dg/Makefile b/1990/dg/Makefile
index 254314d80..167254dd4 100644
--- a/1990/dg/Makefile
+++ b/1990/dg/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/jaw/Makefile b/1990/jaw/Makefile
index 86fa254e4..f86f67bf0 100644
--- a/1990/jaw/Makefile
+++ b/1990/jaw/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/pjr/Makefile b/1990/pjr/Makefile
index 11922649d..950cb371a 100644
--- a/1990/pjr/Makefile
+++ b/1990/pjr/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/scjones/Makefile b/1990/scjones/Makefile
index 0743e154e..60b3b7ea0 100644
--- a/1990/scjones/Makefile
+++ b/1990/scjones/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/stig/Makefile b/1990/stig/Makefile
index da8ceb3be..2d6df25ca 100644
--- a/1990/stig/Makefile
+++ b/1990/stig/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/tbr/Makefile b/1990/tbr/Makefile
index 8f5d3bb26..c8c2c1162 100644
--- a/1990/tbr/Makefile
+++ b/1990/tbr/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/theorem/Makefile b/1990/theorem/Makefile
index 6109ff608..cb3aec200 100644
--- a/1990/theorem/Makefile
+++ b/1990/theorem/Makefile
@@ -207,6 +207,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1990/westley/Makefile b/1990/westley/Makefile
index 734307e71..da7dfd0ab 100644
--- a/1990/westley/Makefile
+++ b/1990/westley/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/Makefile b/1991/Makefile
index 558f87ad1..98b6ea7a1 100644
--- a/1991/Makefile
+++ b/1991/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1991/ant/Makefile b/1991/ant/Makefile
index 125f769b8..41a6933d8 100644
--- a/1991/ant/Makefile
+++ b/1991/ant/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/brnstnd/Makefile b/1991/brnstnd/Makefile
index e4342e336..5825226e4 100644
--- a/1991/brnstnd/Makefile
+++ b/1991/brnstnd/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/buzzard/Makefile b/1991/buzzard/Makefile
index e6d7e3dbb..4c1b6dbc9 100644
--- a/1991/buzzard/Makefile
+++ b/1991/buzzard/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/cdupont/Makefile b/1991/cdupont/Makefile
index 74a4692d5..b358c2e84 100644
--- a/1991/cdupont/Makefile
+++ b/1991/cdupont/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/davidguy/Makefile b/1991/davidguy/Makefile
index b522e140f..8b03c7577 100644
--- a/1991/davidguy/Makefile
+++ b/1991/davidguy/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/dds/Makefile b/1991/dds/Makefile
index 4934429d5..79c6ac6e4 100644
--- a/1991/dds/Makefile
+++ b/1991/dds/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/fine/Makefile b/1991/fine/Makefile
index 5bfc6067a..fb065340b 100644
--- a/1991/fine/Makefile
+++ b/1991/fine/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/rince/Makefile b/1991/rince/Makefile
index c82f537cf..312dbd4ce 100644
--- a/1991/rince/Makefile
+++ b/1991/rince/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1991/westley/Makefile b/1991/westley/Makefile
index d58e2dc3a..a26a19a1f 100644
--- a/1991/westley/Makefile
+++ b/1991/westley/Makefile
@@ -290,6 +290,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/Makefile b/1992/Makefile
index 892bc5244..9059e943a 100644
--- a/1992/Makefile
+++ b/1992/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1992/adrian/Makefile b/1992/adrian/Makefile
index eadb26c34..ec37def4d 100644
--- a/1992/adrian/Makefile
+++ b/1992/adrian/Makefile
@@ -211,6 +211,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/albert/Makefile b/1992/albert/Makefile
index 941203307..e62b64fea 100644
--- a/1992/albert/Makefile
+++ b/1992/albert/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/ant/Makefile b/1992/ant/Makefile
index 9ba9334e6..cb5a20d8f 100644
--- a/1992/ant/Makefile
+++ b/1992/ant/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/buzzard.1/Makefile b/1992/buzzard.1/Makefile
index bcb47e111..869485286 100644
--- a/1992/buzzard.1/Makefile
+++ b/1992/buzzard.1/Makefile
@@ -216,6 +216,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/buzzard.2/Makefile b/1992/buzzard.2/Makefile
index b48f6adbd..3074e911d 100644
--- a/1992/buzzard.2/Makefile
+++ b/1992/buzzard.2/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/gson/Makefile b/1992/gson/Makefile
index 9c28a4e73..3c8dc7e77 100644
--- a/1992/gson/Makefile
+++ b/1992/gson/Makefile
@@ -196,6 +196,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/imc/Makefile b/1992/imc/Makefile
index 4607e54b1..7de0b0030 100644
--- a/1992/imc/Makefile
+++ b/1992/imc/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/kivinen/Makefile b/1992/kivinen/Makefile
index 2e71b8f0a..ffce6f146 100644
--- a/1992/kivinen/Makefile
+++ b/1992/kivinen/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/lush/Makefile b/1992/lush/Makefile
index 983a3d756..8e11a7846 100644
--- a/1992/lush/Makefile
+++ b/1992/lush/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/marangon/Makefile b/1992/marangon/Makefile
index 94e89182f..19b15dbd5 100644
--- a/1992/marangon/Makefile
+++ b/1992/marangon/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/nathan/Makefile b/1992/nathan/Makefile
index 828ff16a5..0c81ae691 100644
--- a/1992/nathan/Makefile
+++ b/1992/nathan/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/vern/Makefile b/1992/vern/Makefile
index 0aaa5f638..eb712e502 100644
--- a/1992/vern/Makefile
+++ b/1992/vern/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1992/westley/Makefile b/1992/westley/Makefile
index 88336649e..172ab259d 100644
--- a/1992/westley/Makefile
+++ b/1992/westley/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/Makefile b/1993/Makefile
index d29e706bd..f4acb0ef6 100644
--- a/1993/Makefile
+++ b/1993/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1993/ant/Makefile b/1993/ant/Makefile
index ff099a6aa..bdee1e802 100644
--- a/1993/ant/Makefile
+++ b/1993/ant/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/cmills/Makefile b/1993/cmills/Makefile
index 885b5a920..f8049dbd9 100644
--- a/1993/cmills/Makefile
+++ b/1993/cmills/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/dgibson/Makefile b/1993/dgibson/Makefile
index fdca2d9c5..cb7c5a06f 100644
--- a/1993/dgibson/Makefile
+++ b/1993/dgibson/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/ejb/Makefile b/1993/ejb/Makefile
index 06ba4841d..0fc0a8c31 100644
--- a/1993/ejb/Makefile
+++ b/1993/ejb/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/jonth/Makefile b/1993/jonth/Makefile
index 78607abc6..d1c8b6d67 100644
--- a/1993/jonth/Makefile
+++ b/1993/jonth/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/leo/Makefile b/1993/leo/Makefile
index d87d3dfab..5fa0e5de4 100644
--- a/1993/leo/Makefile
+++ b/1993/leo/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/lmfjyh/Makefile b/1993/lmfjyh/Makefile
index 5414efe2d..2c7ddda35 100644
--- a/1993/lmfjyh/Makefile
+++ b/1993/lmfjyh/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/plummer/Makefile b/1993/plummer/Makefile
index f07320a4f..a4584045f 100644
--- a/1993/plummer/Makefile
+++ b/1993/plummer/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/rince/Makefile b/1993/rince/Makefile
index 316135ca1..1590b8178 100644
--- a/1993/rince/Makefile
+++ b/1993/rince/Makefile
@@ -209,6 +209,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/schnitzi/Makefile b/1993/schnitzi/Makefile
index ebfd377cb..33ecca59e 100644
--- a/1993/schnitzi/Makefile
+++ b/1993/schnitzi/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1993/vanb/Makefile b/1993/vanb/Makefile
index bd6544ccc..74dec8af2 100644
--- a/1993/vanb/Makefile
+++ b/1993/vanb/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/Makefile b/1994/Makefile
index d8cd52d84..e6ba576fd 100644
--- a/1994/Makefile
+++ b/1994/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1994/dodsond1/Makefile b/1994/dodsond1/Makefile
index 08633212f..60046e98e 100644
--- a/1994/dodsond1/Makefile
+++ b/1994/dodsond1/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/dodsond2/Makefile b/1994/dodsond2/Makefile
index 0de5fe3e5..12786db39 100644
--- a/1994/dodsond2/Makefile
+++ b/1994/dodsond2/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/horton/Makefile b/1994/horton/Makefile
index 6c8efe013..d920f8fdc 100644
--- a/1994/horton/Makefile
+++ b/1994/horton/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/imc/Makefile b/1994/imc/Makefile
index e7f5f3638..38c4d76a5 100644
--- a/1994/imc/Makefile
+++ b/1994/imc/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/ldb/Makefile b/1994/ldb/Makefile
index cb2f90194..32c2c5d8f 100644
--- a/1994/ldb/Makefile
+++ b/1994/ldb/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/schnitzi/Makefile b/1994/schnitzi/Makefile
index e63301a68..b19f80c7f 100644
--- a/1994/schnitzi/Makefile
+++ b/1994/schnitzi/Makefile
@@ -196,6 +196,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/shapiro/Makefile b/1994/shapiro/Makefile
index c16cc53d1..719661098 100644
--- a/1994/shapiro/Makefile
+++ b/1994/shapiro/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/smr/Makefile b/1994/smr/Makefile
index 7e7b7b660..c1aaf14fb 100644
--- a/1994/smr/Makefile
+++ b/1994/smr/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/tvr/Makefile b/1994/tvr/Makefile
index 6d882a60a..e682ed034 100644
--- a/1994/tvr/Makefile
+++ b/1994/tvr/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/weisberg/Makefile b/1994/weisberg/Makefile
index 17ebe40d7..f7a7b3a5e 100644
--- a/1994/weisberg/Makefile
+++ b/1994/weisberg/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1994/westley/Makefile b/1994/westley/Makefile
index ebb6ce81d..cda9acaa9 100644
--- a/1994/westley/Makefile
+++ b/1994/westley/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/Makefile b/1995/Makefile
index b523fb40e..e83567eda 100644
--- a/1995/Makefile
+++ b/1995/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1995/cdua/Makefile b/1995/cdua/Makefile
index 89a51d167..4e91c6959 100644
--- a/1995/cdua/Makefile
+++ b/1995/cdua/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/dodsond1/Makefile b/1995/dodsond1/Makefile
index 245711030..d67a942b2 100644
--- a/1995/dodsond1/Makefile
+++ b/1995/dodsond1/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/dodsond2/Makefile b/1995/dodsond2/Makefile
index 2e5bceeb7..8ab075f03 100644
--- a/1995/dodsond2/Makefile
+++ b/1995/dodsond2/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/esde/Makefile b/1995/esde/Makefile
index 540b5099b..20504e821 100644
--- a/1995/esde/Makefile
+++ b/1995/esde/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/garry/Makefile b/1995/garry/Makefile
index 4588e267e..2acb25a36 100644
--- a/1995/garry/Makefile
+++ b/1995/garry/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/heathbar/Makefile b/1995/heathbar/Makefile
index 9c109065a..1ab50adb9 100644
--- a/1995/heathbar/Makefile
+++ b/1995/heathbar/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/leo/Makefile b/1995/leo/Makefile
index ad50ee0ea..e869c3061 100644
--- a/1995/leo/Makefile
+++ b/1995/leo/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/makarios/Makefile b/1995/makarios/Makefile
index 7f357ab69..d128cda77 100644
--- a/1995/makarios/Makefile
+++ b/1995/makarios/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/savastio/Makefile b/1995/savastio/Makefile
index f97bc8d54..ce3d09aa7 100644
--- a/1995/savastio/Makefile
+++ b/1995/savastio/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/schnitzi/Makefile b/1995/schnitzi/Makefile
index 24733599e..ece41d5a8 100644
--- a/1995/schnitzi/Makefile
+++ b/1995/schnitzi/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/spinellis/Makefile b/1995/spinellis/Makefile
index f82177dff..c4bf9285e 100644
--- a/1995/spinellis/Makefile
+++ b/1995/spinellis/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1995/vanschnitz/Makefile b/1995/vanschnitz/Makefile
index 7342baac1..0fa01270d 100644
--- a/1995/vanschnitz/Makefile
+++ b/1995/vanschnitz/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/Makefile b/1996/Makefile
index 1d884aa07..4c80ad746 100644
--- a/1996/Makefile
+++ b/1996/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1996/august/Makefile b/1996/august/Makefile
index 8e50fa200..3e5df7ef0 100644
--- a/1996/august/Makefile
+++ b/1996/august/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/dalbec/Makefile b/1996/dalbec/Makefile
index 89a22e8cf..af2889f4a 100644
--- a/1996/dalbec/Makefile
+++ b/1996/dalbec/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/eldby/Makefile b/1996/eldby/Makefile
index 425e5df76..60810fd28 100644
--- a/1996/eldby/Makefile
+++ b/1996/eldby/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/gandalf/Makefile b/1996/gandalf/Makefile
index 4a3c8ee38..b0e482104 100644
--- a/1996/gandalf/Makefile
+++ b/1996/gandalf/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/huffman/Makefile b/1996/huffman/Makefile
index 15986cd03..429948965 100644
--- a/1996/huffman/Makefile
+++ b/1996/huffman/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/jonth/Makefile b/1996/jonth/Makefile
index 3b16470a3..f91f801e1 100644
--- a/1996/jonth/Makefile
+++ b/1996/jonth/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/rcm/Makefile b/1996/rcm/Makefile
index fca44e185..12315a3b7 100644
--- a/1996/rcm/Makefile
+++ b/1996/rcm/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/schweikh1/Makefile b/1996/schweikh1/Makefile
index 585b2cc66..c856bea14 100644
--- a/1996/schweikh1/Makefile
+++ b/1996/schweikh1/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/schweikh2/Makefile b/1996/schweikh2/Makefile
index 7b5bcbbcc..4dbdf34fa 100644
--- a/1996/schweikh2/Makefile
+++ b/1996/schweikh2/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/schweikh3/Makefile b/1996/schweikh3/Makefile
index a3994795f..9fcc955dd 100644
--- a/1996/schweikh3/Makefile
+++ b/1996/schweikh3/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1996/westley/Makefile b/1996/westley/Makefile
index e670e7351..2cb49aaa8 100644
--- a/1996/westley/Makefile
+++ b/1996/westley/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/Makefile b/1998/Makefile
index a91d1c327..9567c33b7 100644
--- a/1998/Makefile
+++ b/1998/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/1998/banks/Makefile b/1998/banks/Makefile
index 0a6c21064..199cc9e8a 100644
--- a/1998/banks/Makefile
+++ b/1998/banks/Makefile
@@ -202,6 +202,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/bas1/Makefile b/1998/bas1/Makefile
index e5fbe7b7f..3a0b8712c 100644
--- a/1998/bas1/Makefile
+++ b/1998/bas1/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/bas2/Makefile b/1998/bas2/Makefile
index d114891e6..a8f5fad80 100644
--- a/1998/bas2/Makefile
+++ b/1998/bas2/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/chaos/Makefile b/1998/chaos/Makefile
index 10a9c2710..e58fb64bd 100644
--- a/1998/chaos/Makefile
+++ b/1998/chaos/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/df/Makefile b/1998/df/Makefile
index 0277c88df..fb9e0bb46 100644
--- a/1998/df/Makefile
+++ b/1998/df/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/dlowe/Makefile b/1998/dlowe/Makefile
index a3aff6987..a502e7add 100644
--- a/1998/dlowe/Makefile
+++ b/1998/dlowe/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/dloweneil/Makefile b/1998/dloweneil/Makefile
index 518f8f71e..1a23e12f0 100644
--- a/1998/dloweneil/Makefile
+++ b/1998/dloweneil/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/dorssel/Makefile b/1998/dorssel/Makefile
index eb9c9a6ff..6217576fe 100644
--- a/1998/dorssel/Makefile
+++ b/1998/dorssel/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/fanf/Makefile b/1998/fanf/Makefile
index 5f8eed97d..7299dfb54 100644
--- a/1998/fanf/Makefile
+++ b/1998/fanf/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/schnitzi/Makefile b/1998/schnitzi/Makefile
index cc262bb71..9f82c77e3 100644
--- a/1998/schnitzi/Makefile
+++ b/1998/schnitzi/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/schweikh1/Makefile b/1998/schweikh1/Makefile
index 5216774f8..812f40865 100644
--- a/1998/schweikh1/Makefile
+++ b/1998/schweikh1/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/schweikh2/Makefile b/1998/schweikh2/Makefile
index d5045d573..e6b679330 100644
--- a/1998/schweikh2/Makefile
+++ b/1998/schweikh2/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/schweikh3/Makefile b/1998/schweikh3/Makefile
index f68255d73..8c9281799 100644
--- a/1998/schweikh3/Makefile
+++ b/1998/schweikh3/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/1998/tomtorfs/Makefile b/1998/tomtorfs/Makefile
index a76f93dff..4458ef85c 100644
--- a/1998/tomtorfs/Makefile
+++ b/1998/tomtorfs/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/Makefile b/2000/Makefile
index e0855a2fb..e468bb7b0 100644
--- a/2000/Makefile
+++ b/2000/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2000/anderson/Makefile b/2000/anderson/Makefile
index 6c2938c30..07e0799d5 100644
--- a/2000/anderson/Makefile
+++ b/2000/anderson/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/bellard/Makefile b/2000/bellard/Makefile
index c89e8c196..3d2b7a947 100644
--- a/2000/bellard/Makefile
+++ b/2000/bellard/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/bmeyer/Makefile b/2000/bmeyer/Makefile
index 0964bbdcb..ea119a6e6 100644
--- a/2000/bmeyer/Makefile
+++ b/2000/bmeyer/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/briddlebane/Makefile b/2000/briddlebane/Makefile
index 153530d25..4fe842ce7 100644
--- a/2000/briddlebane/Makefile
+++ b/2000/briddlebane/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/dhyang/Makefile b/2000/dhyang/Makefile
index 20de90072..b3764cd54 100644
--- a/2000/dhyang/Makefile
+++ b/2000/dhyang/Makefile
@@ -212,6 +212,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/dlowe/Makefile b/2000/dlowe/Makefile
index 80d28858a..ba77e7a46 100644
--- a/2000/dlowe/Makefile
+++ b/2000/dlowe/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/jarijyrki/Makefile b/2000/jarijyrki/Makefile
index edd0a195d..e0a3c1b40 100644
--- a/2000/jarijyrki/Makefile
+++ b/2000/jarijyrki/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/natori/Makefile b/2000/natori/Makefile
index 795602e69..3cc1c13af 100644
--- a/2000/natori/Makefile
+++ b/2000/natori/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/primenum/Makefile b/2000/primenum/Makefile
index 1349563c3..dfd039f92 100644
--- a/2000/primenum/Makefile
+++ b/2000/primenum/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/rince/Makefile b/2000/rince/Makefile
index 395f0b6ff..d32f9e1ce 100644
--- a/2000/rince/Makefile
+++ b/2000/rince/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/robison/Makefile b/2000/robison/Makefile
index 52b2de93c..5a98655d1 100644
--- a/2000/robison/Makefile
+++ b/2000/robison/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/schneiderwent/Makefile b/2000/schneiderwent/Makefile
index d61f80cd1..5e36432f9 100644
--- a/2000/schneiderwent/Makefile
+++ b/2000/schneiderwent/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/thadgavin/Makefile b/2000/thadgavin/Makefile
index 15bb5455b..eb7be8adc 100644
--- a/2000/thadgavin/Makefile
+++ b/2000/thadgavin/Makefile
@@ -199,6 +199,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2000/tomx/Makefile b/2000/tomx/Makefile
index 7c9db015c..c804cfbd1 100644
--- a/2000/tomx/Makefile
+++ b/2000/tomx/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/Makefile b/2001/Makefile
index ca77d8e15..88806c464 100644
--- a/2001/Makefile
+++ b/2001/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2001/anonymous/Makefile b/2001/anonymous/Makefile
index ac0ab22e0..5bfa1efa5 100644
--- a/2001/anonymous/Makefile
+++ b/2001/anonymous/Makefile
@@ -236,6 +236,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/bellard/Makefile b/2001/bellard/Makefile
index 23fc9d5ba..80bb0fed5 100644
--- a/2001/bellard/Makefile
+++ b/2001/bellard/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/cheong/Makefile b/2001/cheong/Makefile
index d1e9fbf0b..d78d2bd27 100644
--- a/2001/cheong/Makefile
+++ b/2001/cheong/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/coupard/Makefile b/2001/coupard/Makefile
index a6ddcb702..87cc00705 100644
--- a/2001/coupard/Makefile
+++ b/2001/coupard/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/ctk/Makefile b/2001/ctk/Makefile
index 0cf35c2f5..e57dad775 100644
--- a/2001/ctk/Makefile
+++ b/2001/ctk/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/dgbeards/Makefile b/2001/dgbeards/Makefile
index 719da4830..ce24c4a81 100644
--- a/2001/dgbeards/Makefile
+++ b/2001/dgbeards/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/herrmann1/Makefile b/2001/herrmann1/Makefile
index 8558d5de3..f1c5be169 100644
--- a/2001/herrmann1/Makefile
+++ b/2001/herrmann1/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/herrmann2/Makefile b/2001/herrmann2/Makefile
index 14caeb020..dc61ae765 100644
--- a/2001/herrmann2/Makefile
+++ b/2001/herrmann2/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/jason/Makefile b/2001/jason/Makefile
index 16ba2ab6e..c77a8ab64 100644
--- a/2001/jason/Makefile
+++ b/2001/jason/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/kev/Makefile b/2001/kev/Makefile
index edbb9901c..3e75d7064 100644
--- a/2001/kev/Makefile
+++ b/2001/kev/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/ollinger/Makefile b/2001/ollinger/Makefile
index b2da5fc0d..03328ca36 100644
--- a/2001/ollinger/Makefile
+++ b/2001/ollinger/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/rosten/Makefile b/2001/rosten/Makefile
index 1dcfcf26d..6e4d0eb11 100644
--- a/2001/rosten/Makefile
+++ b/2001/rosten/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/schweikh/Makefile b/2001/schweikh/Makefile
index 05e013419..98bfc7189 100644
--- a/2001/schweikh/Makefile
+++ b/2001/schweikh/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/westley/Makefile b/2001/westley/Makefile
index 412223f0a..bca0a2458 100644
--- a/2001/westley/Makefile
+++ b/2001/westley/Makefile
@@ -213,6 +213,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2001/williams/Makefile b/2001/williams/Makefile
index 95cf1373a..9df1437f3 100644
--- a/2001/williams/Makefile
+++ b/2001/williams/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/Makefile b/2004/Makefile
index fc3a3ad0e..9961c0ce5 100644
--- a/2004/Makefile
+++ b/2004/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2004/anonymous/Makefile b/2004/anonymous/Makefile
index d35119a8d..1350bebb5 100644
--- a/2004/anonymous/Makefile
+++ b/2004/anonymous/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/arachnid/Makefile b/2004/arachnid/Makefile
index 474b6a757..4b32a33e0 100644
--- a/2004/arachnid/Makefile
+++ b/2004/arachnid/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/burley/Makefile b/2004/burley/Makefile
index 79bc12f3f..23b62d8bb 100644
--- a/2004/burley/Makefile
+++ b/2004/burley/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/gavare/Makefile b/2004/gavare/Makefile
index 30afe86ac..c83f9e9e6 100644
--- a/2004/gavare/Makefile
+++ b/2004/gavare/Makefile
@@ -199,6 +199,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/gavin/Makefile b/2004/gavin/Makefile
index b9ad22a34..91d5103bf 100644
--- a/2004/gavin/Makefile
+++ b/2004/gavin/Makefile
@@ -232,6 +232,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/hibachi/Makefile b/2004/hibachi/Makefile
index b933b7c54..153800b5d 100644
--- a/2004/hibachi/Makefile
+++ b/2004/hibachi/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/hoyle/Makefile b/2004/hoyle/Makefile
index 90afa3af1..275e692aa 100644
--- a/2004/hoyle/Makefile
+++ b/2004/hoyle/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/jdalbec/Makefile b/2004/jdalbec/Makefile
index ab1ef173a..7c509a8b8 100644
--- a/2004/jdalbec/Makefile
+++ b/2004/jdalbec/Makefile
@@ -199,6 +199,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/kopczynski/Makefile b/2004/kopczynski/Makefile
index a4fdf241e..378d3b99d 100644
--- a/2004/kopczynski/Makefile
+++ b/2004/kopczynski/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/newbern/Makefile b/2004/newbern/Makefile
index 4c71a9064..eac015bf8 100644
--- a/2004/newbern/Makefile
+++ b/2004/newbern/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/omoikane/Makefile b/2004/omoikane/Makefile
index faf81731b..6ac85c6b6 100644
--- a/2004/omoikane/Makefile
+++ b/2004/omoikane/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/schnitzi/Makefile b/2004/schnitzi/Makefile
index 995c6e3f6..05797ec20 100644
--- a/2004/schnitzi/Makefile
+++ b/2004/schnitzi/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/sds/Makefile b/2004/sds/Makefile
index 77f453a01..42d13786c 100644
--- a/2004/sds/Makefile
+++ b/2004/sds/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/vik1/Makefile b/2004/vik1/Makefile
index def519eda..0e1dbf096 100644
--- a/2004/vik1/Makefile
+++ b/2004/vik1/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2004/vik2/Makefile b/2004/vik2/Makefile
index 2bc920181..e5aa3b843 100644
--- a/2004/vik2/Makefile
+++ b/2004/vik2/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/Makefile b/2005/Makefile
index 11cfdb12f..d4f5921c4 100644
--- a/2005/Makefile
+++ b/2005/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2005/aidan/Makefile b/2005/aidan/Makefile
index 51b9795af..a8316a53c 100644
--- a/2005/aidan/Makefile
+++ b/2005/aidan/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/anon/Makefile b/2005/anon/Makefile
index 4d2ca6718..98ef40a1c 100644
--- a/2005/anon/Makefile
+++ b/2005/anon/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/boutines/Makefile b/2005/boutines/Makefile
index cb76ca449..c0c56c935 100644
--- a/2005/boutines/Makefile
+++ b/2005/boutines/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/chia/Makefile b/2005/chia/Makefile
index da9a2018a..6de01c08f 100644
--- a/2005/chia/Makefile
+++ b/2005/chia/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/giljade/Makefile b/2005/giljade/Makefile
index cb200f713..9a94f4d9d 100644
--- a/2005/giljade/Makefile
+++ b/2005/giljade/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/jetro/Makefile b/2005/jetro/Makefile
index f92dd9a4d..c63cc27c7 100644
--- a/2005/jetro/Makefile
+++ b/2005/jetro/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/klausler/Makefile b/2005/klausler/Makefile
index 074320936..76be09f5d 100644
--- a/2005/klausler/Makefile
+++ b/2005/klausler/Makefile
@@ -205,6 +205,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/mikeash/Makefile b/2005/mikeash/Makefile
index b6e7169aa..7cfc1b208 100644
--- a/2005/mikeash/Makefile
+++ b/2005/mikeash/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/mynx/Makefile b/2005/mynx/Makefile
index 3e859ecb4..aa9720591 100644
--- a/2005/mynx/Makefile
+++ b/2005/mynx/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/persano/Makefile b/2005/persano/Makefile
index 04193326c..8c7302eef 100644
--- a/2005/persano/Makefile
+++ b/2005/persano/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/sykes/Makefile b/2005/sykes/Makefile
index 0b8c84246..dfe8e6d78 100644
--- a/2005/sykes/Makefile
+++ b/2005/sykes/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/timwi/Makefile b/2005/timwi/Makefile
index b567ca5ef..b51781cd3 100644
--- a/2005/timwi/Makefile
+++ b/2005/timwi/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/toledo/Makefile b/2005/toledo/Makefile
index 51eea8d0b..29da526cf 100644
--- a/2005/toledo/Makefile
+++ b/2005/toledo/Makefile
@@ -189,6 +189,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/vik/Makefile b/2005/vik/Makefile
index 1a2c2b57f..6e2a8f8e0 100644
--- a/2005/vik/Makefile
+++ b/2005/vik/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2005/vince/Makefile b/2005/vince/Makefile
index 6f93c60d0..d4e95d602 100644
--- a/2005/vince/Makefile
+++ b/2005/vince/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/Makefile b/2006/Makefile
index e8e8b6413..113702061 100644
--- a/2006/Makefile
+++ b/2006/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2006/birken/Makefile b/2006/birken/Makefile
index 280ca05e3..74858ccc8 100644
--- a/2006/birken/Makefile
+++ b/2006/birken/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/borsanyi/Makefile b/2006/borsanyi/Makefile
index 4098e55fa..5ce5bffca 100644
--- a/2006/borsanyi/Makefile
+++ b/2006/borsanyi/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/grothe/Makefile b/2006/grothe/Makefile
index 4b8eb727d..78a674479 100644
--- a/2006/grothe/Makefile
+++ b/2006/grothe/Makefile
@@ -181,6 +181,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/hamre/Makefile b/2006/hamre/Makefile
index b6918ae11..8d804d2a1 100644
--- a/2006/hamre/Makefile
+++ b/2006/hamre/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/meyer/Makefile b/2006/meyer/Makefile
index eae02082b..e2a4965bf 100644
--- a/2006/meyer/Makefile
+++ b/2006/meyer/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/monge/Makefile b/2006/monge/Makefile
index 608371895..1dbb9f4d0 100644
--- a/2006/monge/Makefile
+++ b/2006/monge/Makefile
@@ -198,6 +198,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/night/Makefile b/2006/night/Makefile
index 5a1958aeb..2692c4eb8 100644
--- a/2006/night/Makefile
+++ b/2006/night/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/sloane/Makefile b/2006/sloane/Makefile
index 184b9d0a3..10de30caa 100644
--- a/2006/sloane/Makefile
+++ b/2006/sloane/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/stewart/Makefile b/2006/stewart/Makefile
index 99d58adc4..ee0d7ce0d 100644
--- a/2006/stewart/Makefile
+++ b/2006/stewart/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/sykes1/Makefile b/2006/sykes1/Makefile
index 35a2dd706..1d0918db6 100644
--- a/2006/sykes1/Makefile
+++ b/2006/sykes1/Makefile
@@ -198,6 +198,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/sykes2/Makefile b/2006/sykes2/Makefile
index 1978f2932..8ac57fafa 100644
--- a/2006/sykes2/Makefile
+++ b/2006/sykes2/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/toledo1/Makefile b/2006/toledo1/Makefile
index 4fded2929..052f1252b 100644
--- a/2006/toledo1/Makefile
+++ b/2006/toledo1/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/toledo2/Makefile b/2006/toledo2/Makefile
index d1eb8982c..e5aedf7de 100644
--- a/2006/toledo2/Makefile
+++ b/2006/toledo2/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2006/toledo3/Makefile b/2006/toledo3/Makefile
index 9dfb42450..1edaa5fb2 100644
--- a/2006/toledo3/Makefile
+++ b/2006/toledo3/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/Makefile b/2011/Makefile
index 0bb1ee035..488e0b96d 100644
--- a/2011/Makefile
+++ b/2011/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2011/akari/Makefile b/2011/akari/Makefile
index 4dcec6270..b728a98f2 100644
--- a/2011/akari/Makefile
+++ b/2011/akari/Makefile
@@ -206,6 +206,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/blakely/Makefile b/2011/blakely/Makefile
index c19015af9..77715603d 100644
--- a/2011/blakely/Makefile
+++ b/2011/blakely/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/borsanyi/Makefile b/2011/borsanyi/Makefile
index 0920c43ef..2542f72b1 100644
--- a/2011/borsanyi/Makefile
+++ b/2011/borsanyi/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/dlowe/Makefile b/2011/dlowe/Makefile
index e8a4a9247..4e98ac82c 100644
--- a/2011/dlowe/Makefile
+++ b/2011/dlowe/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/eastman/Makefile b/2011/eastman/Makefile
index fd48a37f3..632441cc0 100644
--- a/2011/eastman/Makefile
+++ b/2011/eastman/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/fredriksson/Makefile b/2011/fredriksson/Makefile
index 9dda3e13d..2fec7a1c6 100644
--- a/2011/fredriksson/Makefile
+++ b/2011/fredriksson/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/goren/Makefile b/2011/goren/Makefile
index 9b453c56a..021104809 100644
--- a/2011/goren/Makefile
+++ b/2011/goren/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/hamaji/Makefile b/2011/hamaji/Makefile
index fedb6a6bf..9954dc462 100644
--- a/2011/hamaji/Makefile
+++ b/2011/hamaji/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/hou/Makefile b/2011/hou/Makefile
index d83aecc6e..07f260f77 100644
--- a/2011/hou/Makefile
+++ b/2011/hou/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/konno/Makefile b/2011/konno/Makefile
index 4df1343b3..36f6ed5d4 100644
--- a/2011/konno/Makefile
+++ b/2011/konno/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/richards/Makefile b/2011/richards/Makefile
index d767f98a4..7e7ca10e4 100644
--- a/2011/richards/Makefile
+++ b/2011/richards/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/toledo/Makefile b/2011/toledo/Makefile
index 2e1b3dcae..f376c1663 100644
--- a/2011/toledo/Makefile
+++ b/2011/toledo/Makefile
@@ -203,6 +203,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/vik/Makefile b/2011/vik/Makefile
index 684334b7c..bab9c4f89 100644
--- a/2011/vik/Makefile
+++ b/2011/vik/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2011/zucker/Makefile b/2011/zucker/Makefile
index 92af3fe3e..3d979d5ca 100644
--- a/2011/zucker/Makefile
+++ b/2011/zucker/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/Makefile b/2012/Makefile
index 84ffd068d..37a08b9fe 100644
--- a/2012/Makefile
+++ b/2012/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2012/blakely/Makefile b/2012/blakely/Makefile
index 5213fc021..bcd328092 100644
--- a/2012/blakely/Makefile
+++ b/2012/blakely/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/deckmyn/Makefile b/2012/deckmyn/Makefile
index 4f0fe530f..097a8bb10 100644
--- a/2012/deckmyn/Makefile
+++ b/2012/deckmyn/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/dlowe/Makefile b/2012/dlowe/Makefile
index 3a35b93a6..b23156f9e 100644
--- a/2012/dlowe/Makefile
+++ b/2012/dlowe/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/endoh1/Makefile b/2012/endoh1/Makefile
index 3228aeaa6..2b40032f6 100644
--- a/2012/endoh1/Makefile
+++ b/2012/endoh1/Makefile
@@ -220,6 +220,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/endoh2/Makefile b/2012/endoh2/Makefile
index 81890e4af..ffe8e1d0b 100644
--- a/2012/endoh2/Makefile
+++ b/2012/endoh2/Makefile
@@ -342,6 +342,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/grothe/Makefile b/2012/grothe/Makefile
index 3e6a0de03..301f98cc5 100644
--- a/2012/grothe/Makefile
+++ b/2012/grothe/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/hamano/Makefile b/2012/hamano/Makefile
index ec34f19a1..56919d9d1 100644
--- a/2012/hamano/Makefile
+++ b/2012/hamano/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/hou/Makefile b/2012/hou/Makefile
index 24d1dfb38..ed77f2409 100644
--- a/2012/hou/Makefile
+++ b/2012/hou/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/kang/Makefile b/2012/kang/Makefile
index baac862a0..0cf99cb4c 100644
--- a/2012/kang/Makefile
+++ b/2012/kang/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/konno/Makefile b/2012/konno/Makefile
index 6144d8bc6..689b688e4 100644
--- a/2012/konno/Makefile
+++ b/2012/konno/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/omoikane/Makefile b/2012/omoikane/Makefile
index 9fcdda167..8de50bc1d 100644
--- a/2012/omoikane/Makefile
+++ b/2012/omoikane/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/tromp/Makefile b/2012/tromp/Makefile
index e8d971b1d..7d7ef4db7 100644
--- a/2012/tromp/Makefile
+++ b/2012/tromp/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/vik/Makefile b/2012/vik/Makefile
index 0454b1343..0b30e34da 100644
--- a/2012/vik/Makefile
+++ b/2012/vik/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2012/zeitak/Makefile b/2012/zeitak/Makefile
index 801122a67..bfb16d503 100644
--- a/2012/zeitak/Makefile
+++ b/2012/zeitak/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/Makefile b/2013/Makefile
index c5c2cbc2f..8ab10500b 100644
--- a/2013/Makefile
+++ b/2013/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2013/birken/Makefile b/2013/birken/Makefile
index 1ff919e35..e6bf8d69b 100644
--- a/2013/birken/Makefile
+++ b/2013/birken/Makefile
@@ -196,6 +196,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/cable1/Makefile b/2013/cable1/Makefile
index 26eed7703..df4460812 100644
--- a/2013/cable1/Makefile
+++ b/2013/cable1/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/cable2/Makefile b/2013/cable2/Makefile
index 15f6a57bb..bec7ee79e 100644
--- a/2013/cable2/Makefile
+++ b/2013/cable2/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/cable3/Makefile b/2013/cable3/Makefile
index 23d7c9d94..5faddd411 100644
--- a/2013/cable3/Makefile
+++ b/2013/cable3/Makefile
@@ -196,6 +196,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/dlowe/Makefile b/2013/dlowe/Makefile
index 62ef39a2a..2b2174185 100644
--- a/2013/dlowe/Makefile
+++ b/2013/dlowe/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/endoh1/Makefile b/2013/endoh1/Makefile
index f6a78fd96..496c34232 100644
--- a/2013/endoh1/Makefile
+++ b/2013/endoh1/Makefile
@@ -197,6 +197,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/endoh2/Makefile b/2013/endoh2/Makefile
index 5cbb5b327..f6d481c56 100644
--- a/2013/endoh2/Makefile
+++ b/2013/endoh2/Makefile
@@ -224,6 +224,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/endoh3/Makefile b/2013/endoh3/Makefile
index 2063f3cfd..f419e61bf 100644
--- a/2013/endoh3/Makefile
+++ b/2013/endoh3/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/endoh4/Makefile b/2013/endoh4/Makefile
index 9f50bb9a0..ded40e601 100644
--- a/2013/endoh4/Makefile
+++ b/2013/endoh4/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/hou/Makefile b/2013/hou/Makefile
index d521c2bcd..448c0b5bc 100644
--- a/2013/hou/Makefile
+++ b/2013/hou/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/mills/Makefile b/2013/mills/Makefile
index 355210d2b..3d9320ddc 100644
--- a/2013/mills/Makefile
+++ b/2013/mills/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/misaka/Makefile b/2013/misaka/Makefile
index edcae62ec..e86a6b507 100644
--- a/2013/misaka/Makefile
+++ b/2013/misaka/Makefile
@@ -258,6 +258,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/morgan1/Makefile b/2013/morgan1/Makefile
index f67521ac1..88cf529b6 100644
--- a/2013/morgan1/Makefile
+++ b/2013/morgan1/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/morgan2/Makefile b/2013/morgan2/Makefile
index c1fc14ee7..86933fd85 100644
--- a/2013/morgan2/Makefile
+++ b/2013/morgan2/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2013/robison/Makefile b/2013/robison/Makefile
index f3b4d867c..dbdb1a195 100644
--- a/2013/robison/Makefile
+++ b/2013/robison/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/Makefile b/2014/Makefile
index 5316242a0..a1e5536e1 100644
--- a/2014/Makefile
+++ b/2014/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2014/birken/Makefile b/2014/birken/Makefile
index 13e5b7768..281e3f94e 100644
--- a/2014/birken/Makefile
+++ b/2014/birken/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/deak/Makefile b/2014/deak/Makefile
index 666f2a4ad..f7a7feeb3 100644
--- a/2014/deak/Makefile
+++ b/2014/deak/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/endoh1/Makefile b/2014/endoh1/Makefile
index 80d93a56c..3fb1466ea 100644
--- a/2014/endoh1/Makefile
+++ b/2014/endoh1/Makefile
@@ -201,6 +201,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/endoh2/Makefile b/2014/endoh2/Makefile
index d91982741..4befe3606 100644
--- a/2014/endoh2/Makefile
+++ b/2014/endoh2/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/maffiodo1/Makefile b/2014/maffiodo1/Makefile
index 2602e021c..f3b69fa00 100644
--- a/2014/maffiodo1/Makefile
+++ b/2014/maffiodo1/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/maffiodo2/Makefile b/2014/maffiodo2/Makefile
index 82b7456a4..aaecc81ff 100644
--- a/2014/maffiodo2/Makefile
+++ b/2014/maffiodo2/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/morgan/Makefile b/2014/morgan/Makefile
index 340f2820b..c3ce4d039 100644
--- a/2014/morgan/Makefile
+++ b/2014/morgan/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/sinon/Makefile b/2014/sinon/Makefile
index f621b9ce4..b4d98ac9c 100644
--- a/2014/sinon/Makefile
+++ b/2014/sinon/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/skeggs/Makefile b/2014/skeggs/Makefile
index 07928051c..86a8db848 100644
--- a/2014/skeggs/Makefile
+++ b/2014/skeggs/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/vik/Makefile b/2014/vik/Makefile
index 269013a29..5592fa8ac 100644
--- a/2014/vik/Makefile
+++ b/2014/vik/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2014/wiedijk/Makefile b/2014/wiedijk/Makefile
index 13641dd72..7e9c2f010 100644
--- a/2014/wiedijk/Makefile
+++ b/2014/wiedijk/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/Makefile b/2015/Makefile
index 3b243c079..ff9b70057 100644
--- a/2015/Makefile
+++ b/2015/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2015/burton/Makefile b/2015/burton/Makefile
index 3b8fc644c..fd1a7d517 100644
--- a/2015/burton/Makefile
+++ b/2015/burton/Makefile
@@ -200,6 +200,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/dogon/Makefile b/2015/dogon/Makefile
index 3ab305dc7..144a7638a 100644
--- a/2015/dogon/Makefile
+++ b/2015/dogon/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/duble/Makefile b/2015/duble/Makefile
index 9f0ab0d18..303d897a8 100644
--- a/2015/duble/Makefile
+++ b/2015/duble/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/endoh1/Makefile b/2015/endoh1/Makefile
index e487e3980..725eb1ff4 100644
--- a/2015/endoh1/Makefile
+++ b/2015/endoh1/Makefile
@@ -249,6 +249,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/endoh2/Makefile b/2015/endoh2/Makefile
index 7ffdeaf4e..d8c55b813 100644
--- a/2015/endoh2/Makefile
+++ b/2015/endoh2/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/endoh3/Makefile b/2015/endoh3/Makefile
index bd1b8a519..5a7a10926 100644
--- a/2015/endoh3/Makefile
+++ b/2015/endoh3/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/endoh4/Makefile b/2015/endoh4/Makefile
index a64fca11a..f134906e6 100644
--- a/2015/endoh4/Makefile
+++ b/2015/endoh4/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/hou/Makefile b/2015/hou/Makefile
index e602a77f5..c5e08c402 100644
--- a/2015/hou/Makefile
+++ b/2015/hou/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/howe/Makefile b/2015/howe/Makefile
index ca8e9a94a..29ed53eb4 100644
--- a/2015/howe/Makefile
+++ b/2015/howe/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/mills1/Makefile b/2015/mills1/Makefile
index 8b8170076..28c3b9960 100644
--- a/2015/mills1/Makefile
+++ b/2015/mills1/Makefile
@@ -345,6 +345,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/mills2/Makefile b/2015/mills2/Makefile
index 75e088574..414d13294 100644
--- a/2015/mills2/Makefile
+++ b/2015/mills2/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/muth/Makefile b/2015/muth/Makefile
index 13c049d2b..6c4fa512d 100644
--- a/2015/muth/Makefile
+++ b/2015/muth/Makefile
@@ -200,6 +200,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/schweikhardt/Makefile b/2015/schweikhardt/Makefile
index 442ccd7f1..50ea79895 100644
--- a/2015/schweikhardt/Makefile
+++ b/2015/schweikhardt/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2015/yang/Makefile b/2015/yang/Makefile
index 145d29eca..5cc6fa4ae 100644
--- a/2015/yang/Makefile
+++ b/2015/yang/Makefile
@@ -211,6 +211,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/Makefile b/2018/Makefile
index 71d1c8d72..5bbbd925f 100644
--- a/2018/Makefile
+++ b/2018/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2018/algmyr/Makefile b/2018/algmyr/Makefile
index c43bad03e..595e9f9ca 100644
--- a/2018/algmyr/Makefile
+++ b/2018/algmyr/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/anderson/Makefile b/2018/anderson/Makefile
index c0d25cba8..516664a28 100644
--- a/2018/anderson/Makefile
+++ b/2018/anderson/Makefile
@@ -186,6 +186,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/bellard/Makefile b/2018/bellard/Makefile
index b2b493290..21352dbb2 100644
--- a/2018/bellard/Makefile
+++ b/2018/bellard/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/burton1/Makefile b/2018/burton1/Makefile
index 29549b2fe..493c22607 100644
--- a/2018/burton1/Makefile
+++ b/2018/burton1/Makefile
@@ -187,6 +187,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/burton2/Makefile b/2018/burton2/Makefile
index b16659e86..724e4ee2d 100644
--- a/2018/burton2/Makefile
+++ b/2018/burton2/Makefile
@@ -219,6 +219,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/ciura/Makefile b/2018/ciura/Makefile
index 2f03dcd3f..c63f06a76 100644
--- a/2018/ciura/Makefile
+++ b/2018/ciura/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/endoh1/Makefile b/2018/endoh1/Makefile
index f4c9c314a..5dc76369f 100644
--- a/2018/endoh1/Makefile
+++ b/2018/endoh1/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/endoh2/Makefile b/2018/endoh2/Makefile
index d1bc2a24b..05f45db83 100644
--- a/2018/endoh2/Makefile
+++ b/2018/endoh2/Makefile
@@ -195,6 +195,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/ferguson/Makefile b/2018/ferguson/Makefile
index 40d9ad489..bd100fedc 100644
--- a/2018/ferguson/Makefile
+++ b/2018/ferguson/Makefile
@@ -194,6 +194,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/giles/Makefile b/2018/giles/Makefile
index 593ea65c9..552f179c9 100644
--- a/2018/giles/Makefile
+++ b/2018/giles/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/hou/Makefile b/2018/hou/Makefile
index aca63fbe1..c275591b4 100644
--- a/2018/hou/Makefile
+++ b/2018/hou/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/mills/Makefile b/2018/mills/Makefile
index f148d8edd..00cf29039 100644
--- a/2018/mills/Makefile
+++ b/2018/mills/Makefile
@@ -269,6 +269,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/poikola/Makefile b/2018/poikola/Makefile
index d7ae30694..9c84abc5e 100644
--- a/2018/poikola/Makefile
+++ b/2018/poikola/Makefile
@@ -190,6 +190,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/vokes/Makefile b/2018/vokes/Makefile
index ca439ae78..091407a66 100644
--- a/2018/vokes/Makefile
+++ b/2018/vokes/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2018/yang/Makefile b/2018/yang/Makefile
index e37f0214c..69358ef13 100644
--- a/2018/yang/Makefile
+++ b/2018/yang/Makefile
@@ -303,6 +303,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/Makefile b/2019/Makefile
index 37dca5914..025642077 100644
--- a/2019/Makefile
+++ b/2019/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2019/adamovsky/Makefile b/2019/adamovsky/Makefile
index 67384e27b..d323810dc 100644
--- a/2019/adamovsky/Makefile
+++ b/2019/adamovsky/Makefile
@@ -202,6 +202,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/burton/Makefile b/2019/burton/Makefile
index 8ce2535fc..84d371b9a 100644
--- a/2019/burton/Makefile
+++ b/2019/burton/Makefile
@@ -197,6 +197,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/ciura/Makefile b/2019/ciura/Makefile
index 7d91c408b..b82a8b8cc 100644
--- a/2019/ciura/Makefile
+++ b/2019/ciura/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/diels-grabsch1/Makefile b/2019/diels-grabsch1/Makefile
index 4a0e14a00..5f8881141 100644
--- a/2019/diels-grabsch1/Makefile
+++ b/2019/diels-grabsch1/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/diels-grabsch2/Makefile b/2019/diels-grabsch2/Makefile
index 7cc3c9864..99933945a 100644
--- a/2019/diels-grabsch2/Makefile
+++ b/2019/diels-grabsch2/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/dogon/Makefile b/2019/dogon/Makefile
index 27cd26c39..7dea8bd1a 100644
--- a/2019/dogon/Makefile
+++ b/2019/dogon/Makefile
@@ -198,6 +198,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/duble/Makefile b/2019/duble/Makefile
index 83a7860e6..a47585a15 100644
--- a/2019/duble/Makefile
+++ b/2019/duble/Makefile
@@ -257,6 +257,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/endoh/Makefile b/2019/endoh/Makefile
index d8b26d3f5..c345cefe1 100644
--- a/2019/endoh/Makefile
+++ b/2019/endoh/Makefile
@@ -191,6 +191,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/giles/Makefile b/2019/giles/Makefile
index 6bf822080..7808d5ba5 100644
--- a/2019/giles/Makefile
+++ b/2019/giles/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/karns/Makefile b/2019/karns/Makefile
index 387adba46..8ecdde01b 100644
--- a/2019/karns/Makefile
+++ b/2019/karns/Makefile
@@ -200,6 +200,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/lynn/Makefile b/2019/lynn/Makefile
index 857adaa29..c90d62c2c 100644
--- a/2019/lynn/Makefile
+++ b/2019/lynn/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/mills/Makefile b/2019/mills/Makefile
index f2adc59e4..bedc59d94 100644
--- a/2019/mills/Makefile
+++ b/2019/mills/Makefile
@@ -365,6 +365,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/poikola/Makefile b/2019/poikola/Makefile
index 9ea888437..5e00f805e 100644
--- a/2019/poikola/Makefile
+++ b/2019/poikola/Makefile
@@ -206,6 +206,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2019/yang/Makefile b/2019/yang/Makefile
index 861d67aa4..a7056720a 100644
--- a/2019/yang/Makefile
+++ b/2019/yang/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/Makefile b/2020/Makefile
index 9b1943794..9e432d57d 100644
--- a/2020/Makefile
+++ b/2020/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-= ${YEAR} begin make $@ =-=-='
 	@echo
diff --git a/2020/burton/Makefile b/2020/burton/Makefile
index 637e5ff2a..a96a6ba18 100644
--- a/2020/burton/Makefile
+++ b/2020/burton/Makefile
@@ -206,6 +206,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/carlini/Makefile b/2020/carlini/Makefile
index 0bc4d71d4..346082b15 100644
--- a/2020/carlini/Makefile
+++ b/2020/carlini/Makefile
@@ -182,6 +182,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/endoh1/Makefile b/2020/endoh1/Makefile
index c43edeaad..3a7ebc3cb 100644
--- a/2020/endoh1/Makefile
+++ b/2020/endoh1/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/endoh2/Makefile b/2020/endoh2/Makefile
index 622637060..35abd9def 100644
--- a/2020/endoh2/Makefile
+++ b/2020/endoh2/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/endoh3/Makefile b/2020/endoh3/Makefile
index 54c90e0ea..fc213a1c5 100644
--- a/2020/endoh3/Makefile
+++ b/2020/endoh3/Makefile
@@ -192,6 +192,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/ferguson1/Makefile b/2020/ferguson1/Makefile
index 47d02aa77..04f641dc1 100644
--- a/2020/ferguson1/Makefile
+++ b/2020/ferguson1/Makefile
@@ -216,6 +216,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/ferguson2/Makefile b/2020/ferguson2/Makefile
index 304536e52..5220a1c36 100644
--- a/2020/ferguson2/Makefile
+++ b/2020/ferguson2/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/giles/Makefile b/2020/giles/Makefile
index 000fdd083..dc8e4154d 100644
--- a/2020/giles/Makefile
+++ b/2020/giles/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/kurdyukov1/Makefile b/2020/kurdyukov1/Makefile
index eafc6d6d6..95fc4287d 100644
--- a/2020/kurdyukov1/Makefile
+++ b/2020/kurdyukov1/Makefile
@@ -185,6 +185,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/kurdyukov2/Makefile b/2020/kurdyukov2/Makefile
index ae535d826..709cfd3e2 100644
--- a/2020/kurdyukov2/Makefile
+++ b/2020/kurdyukov2/Makefile
@@ -193,6 +193,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/kurdyukov3/Makefile b/2020/kurdyukov3/Makefile
index b129bc5d7..1b0e0b4f7 100644
--- a/2020/kurdyukov3/Makefile
+++ b/2020/kurdyukov3/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/kurdyukov4/Makefile b/2020/kurdyukov4/Makefile
index 7e233dc23..982806a63 100644
--- a/2020/kurdyukov4/Makefile
+++ b/2020/kurdyukov4/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/otterness/Makefile b/2020/otterness/Makefile
index 0431bbbad..a7a1e217b 100644
--- a/2020/otterness/Makefile
+++ b/2020/otterness/Makefile
@@ -183,6 +183,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/tsoj/Makefile b/2020/tsoj/Makefile
index ede4d4b83..07d7380cd 100644
--- a/2020/tsoj/Makefile
+++ b/2020/tsoj/Makefile
@@ -184,6 +184,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/2020/yang/Makefile b/2020/yang/Makefile
index fcafb553b..95d95d9e0 100644
--- a/2020/yang/Makefile
+++ b/2020/yang/Makefile
@@ -188,6 +188,7 @@ diff_orig_alt: ${PROG}.orig.c
 	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
 	fi
 
+# diff alt and orig
 diff_alt_orig:
 	@-if [[ -e ${PROG}.alt.c ]]; then \
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
diff --git a/Makefile b/Makefile
index c1e1ae883..f974de10c 100644
--- a/Makefile
+++ b/Makefile
@@ -149,6 +149,7 @@ diff_orig_alt:
         done
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
 
+# diff alt and orig
 diff_alt_orig:
 	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
 	@-for i in ${YEARS}; do \