% slitherlink 638 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/638.a.htm
slitherlink
very hard
19 16
.213.22222...2.....
2...1..1.2.3.1.2.13
..2..3....2..2.231.
12.....2....231.2.2
32.2.1.3..31......3
..1.3...3..2.1..22.
.2.11322.1.1.2.231.
313..2.232........3
.12..22.22.3.323.2.
.2..2..2.21.....21.
..2223..1.3..2.3.22
33.2...21..2.3.3...
2.....2..1.1....1..
2.2.....12.3.02....
12.2....2......322.
...0.23.323.....23.
