% slitherlink 501 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/501.a.htm
slitherlink
medium-
14 10
....13.33.3...
2..232212.21..
3.2.212.2.23..
2.1.3.2.3....3
1.2...3..1311.
.......22..2..
202.2.2..12.12
.33312.3..22..
2...1312.2.3..
22..3.3333..12
