From fa64ed3e875e005452e5ecd639bd1d6099387bd7 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Thu, 7 Jan 2016 19:30:56 +0000
Subject: [PATCH] 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.
---
 puzzles.but | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/puzzles.but b/puzzles.but
index 6b39630..dfb5803 100644
--- a/puzzles.but
+++ b/puzzles.but
@@ -1585,7 +1585,7 @@ of the beam behaviours shown above:
 \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