ref: fa64ed3e875e005452e5ecd639bd1d6099387bd7
parent: 55683abd97f94286982924ff0fecd03044e82bed
author: Simon Tatham <anakin@pobox.com>
date: Thu Jan 7 14:30:56 EST 2016
Fix a typo in the Black Box docs examples. A letter offset by one from a ball on the edge should be an R, not an H. Thanks to Kevin Buzzard for pointing out the error.
--- a/puzzles.but
+++ b/puzzles.but
@@ -1585,7 +1585,7 @@
\c |......O.|
\c H........|
\c |.....O..|
-\c 12-RH---
+\c 12-RR---
As shown, it is possible for a beam to receive multiple reflections
before re-emerging (see turn 3). Similarly, a beam may be reflected