% slitherlink 664 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/664.a.htm
slitherlink
medium
19 10
3.213.1..33.....31.
....2..0....212.322
..23....3.3..121...
33.21.3..2...22.31.
....2.2.2.12032222.
.3.2..32..3.2.1.22.
...1.2..1....111.3.
2..2..21...212..2.2
32.3.2..3.3.2..221.
....22...1322222.23
