Format/typo check 1993/ejb

This includes updates to the patience.md file. The hanoi.md did not
require any changes.

1993/ejb/patience.md

@@ -21,38 +21,39 @@ ring at the end of the rod to its right.  The only rod free
 of this restriction is the rightmost rod.  What has been
 described so far is one of the two components of the puzzle.
 
-The other component is another iron rod shaped like a U.
-The U is as long from the tips to the base as the original
-piece of iron with the holes in it.  The ends of the U are
+The other component is another iron rod shaped like a `U`.
+The `U` is as long from the tips to the base as the original
+piece of iron with the holes in it.  The ends of the `U` are
 looped around another ring of about five centimeters in
-diameter.  In the puzzle's initial configuration, the U is
+diameter.  In the puzzle's initial configuration, the `U` is
 placed through the rings so that it is held in place by the
-iron rods.  Imagine starting with the U piece before the
-iron loop is placed at the end.  Slide the legs of the U
+iron rods.  Imagine starting with the `U` piece before the
+iron loop is placed at the end.  Slide the legs of the `U`
 through the loops so that the iron rods securing the loops
-to the metal strip go up the center of the U.  Placing the
-final ring at the ends of the U prevents it from coming out.
-The object of the puzzle is to free the U-shaped piece from
+to the metal strip go up the center of the `U`.  Placing the
+final ring at the ends of the `U` prevents it from coming out.
+The object of the puzzle is to free the `U`-shaped piece from
 the other piece.
 
 The following illustration (sideways) shows a three-ring
 case of this puzzle.  If you look carefully, you can see
-that the first ring could be lifted over the edge of the U
-and slid down through the center of the U, thereby freeing
-the U from the first iron rod.  The second ring can also be
+that the first ring could be lifted over the edge of the `U`
+and slid down through the center of the `U`, thereby freeing
+the `U` from the first iron rod.  The second ring can also be
 freed in the initial configuration since it is already over
 the rod for the first ring.  The third ring cannot be moved,
-however, since it is blocked by the iron rod two which the
+however, since it is blocked by the iron rod to which the
 first ring is attached.  If the first first is removed, then
 the third ring is no longer blocked by the first ring's iron
 rod and can be removed freely.  The second ring, however
 cannot be moved if the first ring is gone because it will
 then be blocked by the first ring in its new position
-outside of the U.
+outside of the `U`.
 
 Here is an illustration of the three-ring case.  The bottom
 of the puzzle is on the left-hand side of the page.
-
+
+```
 
 
 
@@ -105,7 +106,8 @@ of the puzzle is on the left-hand side of the page.
              \  |                \\ ||
               \ |                 \\||
                \|                  \||
-
+```
+
 This puzzle takes other forms as well.  One such puzzle is
 called "Spin-Out".  This puzzle consists of one plastic
 piece that encases another piece that can slide in and out
@@ -131,14 +133,14 @@ free to move.  The only other piece that is free to move is
 the second one that is still attached to the base it is
 trying to be freed from.  In the case of the original
 puzzle, consider the rings numbered from 1 to 6 with ring 1
-being the one at the closed send of the U.  Ring 1 can
-always be removed from or added to the U.  In the initial
-state, when all rings are around the U, ring 2 is the other
+being the one at the closed end of the `U`.  Ring 1 can
+always be removed from or added to the `U`.  In the initial
+state, when all rings are around the `U`, ring 2 is the other
 one that can be moved because it is second.  If ring 1 is
 removed, then only two operations are possible: the
 restoration of ring 1 and the removal of ring 3.  This is
 because ring 1 is always movable, and ring 3 is currently
-the second ring still attached to the U.  This constraint
+the second ring still attached to the `U`.  This constraint
 leads to a recursive solution to the puzzle.  Like the
 [Towers of Hanoi](hanoi.md), the number of steps to solve this puzzle is
 exponential in the number of rings.