% slitherlink 663 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/663.a.htm
slitherlink
medium-
19 10
0.....333223.3.....
...21.021..3......3
....13.32..3.3222.2
1.232.1.1.2.212..20
.3.1.32.3.....2...0
1122.0.....2.23....
2.3..1.2.12322.2...
21...12.213113.....
232....2.12..1223..
3232....31...3.1...
