% slitherlink 631 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/631.a.htm
slitherlink
medium-
10 10
.3..2123.3
.1....2.1.
.1....1...
..20.322.1
31.....32.
..2.2.2...
.3.3.2113.
3......2..
3.3.2.12..
...12.3...
