% slitherlink 417 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/417.a.htm
slitherlink
medium-
10 10
..3.3....3
2....2212.
.21..3...2
3..121.22.
.2.2.3....
.3.13....1
.2.2..3.3.
...1...1..
.23..032..
...1...22.
