% slitherlink 721 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/721.a.htm
slitherlink
medium-
10 10
0.....3..3
..02.3..22
...11.3..0
30...1....
.......022
221.......
....2...12
2..3.20...
02..1.33..
1..1.....2
