% slitherlink 537 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/537.a.htm
slitherlink
medium-
10 10
33.2.....1
..11.131.0
.1......3.
.2.1..2.21
.2..30....
....32..1.
12.3..3.1.
.3......2.
1.313.22..
1.....0.31
