% slitherlink 549 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/549.a.htm
slitherlink
medium-
10 10
.2.2....1.
22.0.00133
.3........
.0.20.2.23
.0....0...
...1....3.
31.2.10.1.
........2.
13230.3.21
.1....3.3.
