% slitherlink 581 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/581.a.htm
slitherlink
medium-
10 10
.2.....1.3
.333322...
2...2..2..
.2...3..22
.332.12..1
22..3.3.32
22.1..2...
21.13.31.2
..........
3..32.2..3
