% slitherlink 642 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/642.a.htm
slitherlink
medium-
10 10
3.213.....
.2.2.2.2..
1.2..212..
.123.3.3..
....222.13
.3..3.312.
.22..13.23
...1.....2
.....32.3.
3.........
