% slitherlink 674 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/674.a.htm
slitherlink
medium-
10 10
.....1..20
322....2..
213.3...2.
...212....
......1.2.
........32
11233120.3
3..1......
.33.....3.
......1..2
