% slitherlink 556 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/556.a.htm
slitherlink
medium-
10 10
23..2.2...
.2...23...
..23.3..12
2...132..3
1....1..2.
3....3.3..
12.3.20...
..2.......
...2...021
.21...3...
