% slitherlink 507 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/507.a.htm
slitherlink
medium
24 14
..........3..3..33.2312.
2...3.132.1.1...1.......
31323......21...323.1..3
32..2..13...3..32032..22
31.2313.3.1.1.1.....2.3.
.2...2..222.21122...3.1.
.3.3..1.22...3...3222223
.123..2........312...2.2
3.1.22221.022....313202.
3.....12....2132....2...
2.21212..22.32.0...2..22
22.3...1..1112.2.3.1....
22231....322..1..232.021
..02...22...2.2.12..333.
