% slitherlink 381 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/381.a.htm
slitherlink
hard-
20 15
3..21.2.3.13.232..33
.....32..3.2222.....
1..21.....123..3..3.
..1.21...2..2..23.12
112.2.3.322....1.1..
..2.31...3.3.2..312.
313....3121.21......
...2..2....1..21322.
..232.13.0.2.2.3.1..
3..2.......0...231.3
.2.112.311.2...2....
321.331.....23.3.12.
22......12..2.21.332
.2...202...3........
...2.33.322..3...23.
