% slitherlink 407 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/407.a.htm
slitherlink
medium-
10 10
31....3.3.
.3.2.3.23.
1..1...2..
....3.3...
...2...12.
22.2322..1
.33.3..032
.1..2.2...
...3.22.2.
...131..2.
