% slitherlink 311 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/311.a.htm
slitherlink
hard-
16 12
....321.13..2...
201.......32.232
.1.20..2.....132
1.....3...1.2...
.32..301..13.2.2
13.........22..3
..13.3..0..11...
.1....31....0.3.
1..1..1...3.1.1.
.23.10..0...0..3
3.3.....2..1.13.
.1...33.2.3.3..2
