% slitherlink 317 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/317.a.htm
slitherlink
hard-
16 12
..3..22....3.13.
..0...0323.3...3
13..3.....21....
.1..0...1...1..2
.1....32.0.3.312
.13....1..1..1.1
.130.1.21.2.1...
.1....1.2..1..12
..2.121.1.1.3.1.
3..2...3.2....13
2.31.2...21..1..
.3.2..1.21.3.232
