Swap alt/original in 1995/cdua

It is recommended that with 1995/cdua one should start out with the
alternate version as the original goes too fast in modern systems to see
it do its task. The alternate code section has been changed to original
code.

Format and typo checked the README.md too. This is the only entry in
1995 that I have done this for so far and is only done because I wanted
to make the alt code the suggested version to use first.

1995/cdua/README.md

@@ -6,17 +6,17 @@ Portugal
 
 ## To build:
 
+We recommend that you try this alternate version first. For reasons why this is
+see the [original code](#original-code) section below.
+
 ```sh
-make all
+make alt
 ```
 
-NOTE: on modern systems this was hard to see it solve it in real time because it
-goes so quickly so an alternate version which makes it easier with
-modern systems to see the maze actually being solved in real time. We encourage
-you to use that version but we keep the original here to both preserve the
-original code (the bug fixes notwithstanding) and it will also let you see just
-how fast your computer is :-) (and you can also use both to see the difference).
-For this alternate, slower version, please see below.
+This alternate version uses `usleep(3)` with `Z` (defined in the Makefile,
+default `3000`) microseconds to make it easier to see the maze being solved in
+real time. You can redefine `Z` to reconfigure it in case it's going too slow,
+too fast :-) or you're doing some strange experiment like making it 100000.
 
 
 ### Bugs and (Mis)features
@@ -33,45 +33,24 @@ For more detailed information see [1995 cdua in bugs.md](/bugs.md#1995-cdua).
 ## To use:
 
 ```sh
-./cdua
+./cdua.alt
 ```
 
+## Try:
 
-## INABIAF - it's not a bug it's a feature! :-)
-
-NOTE: sometimes the program needs you to press enter a second time to continue
-solving the maze. This is a feature, not a bug. See [bugs.md](/bugs.md) for more
-details.
-
-
-## Alternate code:
-
-This version uses `usleep(3)` with the `Z` (defined in the Makefile, default
-`3000`) microseconds to make it easier to see the maze being solved in real
-time. You can redefine Z to reconfigure it in case it's going too slow, too
-fast :-) or you're doing some strange experiment like making it 100000.
-
-To compile and use without reconfiguring the 3000
-microseconds, try:
-
-```sh
-make clobber alt
-./cdua.alt # press enter
-```
-
-Use `cdua.alt` as you would `cdua` above.
-
-To use a 1500 for `Z` try something like:
+To use 1500 for `Z` do:
 
 ```sh
 make CFLAGS="-DZ=1500" clobber alt
-./cdua.alt # press enter and watch it move a bit slower
+
+./cdua.alt # press enter and watch it go much faster!
 ```
 
-Also try:
+You might also like to try:
 
 ```sh
 make CFLAGS="-DZ=65000" clobber alt
+
 ./cdua.alt # press enter and watch it go much slower!
 ```
 
@@ -80,6 +59,27 @@ Do you see anything strange in this version when `Z` is a high value like
 Why?
 
 
+## Original code:
+
+With modern systems this was hard to see it solve it in real time because it
+goes so quickly which is why we recommend the alternate version first: you can
+actually see it being solved in real time rather than have it go by in a flash.
+
+If you wish to use the original version, for instance if you wish to see how
+fast your computer is :-) or use both to see the difference, you can do so.
+
+## ## Original build:
+
+```sh
+make all
+```
+
+### Original use:
+
+```
+./cdua
+```
+
 ## Judges' remarks:
 
 This could be used as the basis of an a-maze-ing screen exerciser.
@@ -87,10 +87,10 @@ This could be used as the basis of an a-maze-ing screen exerciser.
 
 ## Author's remarks:
 
-A program that generates a maze, and then solves it, all this being
-seen by the user.  Some highlights of obfuscation are: 3 steps
-functions in one - main(), several recursive calls with conditional
-actions, and just one (big and ugly) statement to solve the maze.
+A program that generates a maze, and then solves it, all this being seen by the
+user.  Some highlights of obfuscation are: 3 steps functions in one - `main()`,
+several recursive calls with conditional actions, and just one (big and ugly)
+statement to solve the maze.
 
 
 ## Copyright and CC BY-SA 4.0 License: