% slitherlink 418 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/418.a.htm
slitherlink
medium-
10 10
..3..2.1.3
.3....2.31
..223212..
3......213
22.2.1....
..2.2.13..
....2.21.3
.213.1.3..
23......2.
322.22....
