% slitherlink 437 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/437.a.htm
slitherlink
medium
16 12
.2...3..........
2...3.02.3..23.2
2.221...1...1223
2223...3232.3..2
222....1.3...21.
....22.23.02.3..
.2.20.11.31....3
212.23...312.12.
333......3.2.23.
.2..2.322..12.1.
..23232..1.2....
.212.2.2..31222.
