% slitherlink 516 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/516.a.htm
slitherlink
medium
18 10
3.121..22..312.223
3....2...33.......
2.12..202..2.....3
...1.2...1..1.13.2
.....3..1.1.3.3..3
1..2.0.2.3..2.....
2.13.3..2...0.2...
3.....1..203..02.0
.......11...2....2
112.321..11..022.3
