% slitherlink 168 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/168.a.htm
slitherlink
medium
16 12
31232....231....
.232.1211223..13
3...2..222.1.3..
2..2122..2.113.3
2...3.2.212.22..
.2..2.3....3....
3...2..3.3.1.22.
22.32.1.1..233..
.2.12...2.3.....
3.3.....2...333.
2......2.23..1.2
...322....1.3..2
