% slitherlink 639 by Luke Pebody, http://www.janko.at/Raetsel/Slitherlink/639.a.htm
slitherlink
very hard
19 16
3.31...322.1.1..2.3
..2.32....33...2212
.2...31...112.323..
3.13..2....22...3..
....2...2...1..23..
.2..2...1113.3.....
222....323.31...3.2
.3.2.2112.12....23.
1...2.3..220..12...
23..2222....2222.3.
2..2.3....2..22131.
212..1.13.....1.2..
.1..1.2...11.2..3.3
2232..222.3.2..2.2.
.2........11.2.3.3.
33...3323.2.222212.
