% slitherlink 531 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/531.a.htm
slitherlink
medium-
10 10
.02..3....
.2..1..203
.3.312...2
.....3.2..
0.10...33.
.23...01.2
..0.1.....
3...013.1.
220..1..2.
....3..20.
