% slitherlink 409 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/409.a.htm
slitherlink
medium
10 10
..2..23..3
32223...2.
3...1...2.
.3222.....
..121..112
.23.123...
.132.2.1.2
.22..2.222
..2.2...2.
..22222.1.
