% slitherlink 178 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/178.a.htm
slitherlink
hard-
20 15
3.32...322.122.2.2.3
.....2....33...02.3.
22...312.1.2...0....
21..2......2.1..3..2
31.2212.12....1....2
222...2.3..2.32.2.3.
1.....32.22.23...21.
312221.323.....223..
.3.2.3.3.2.33.....22
1.2.2..2..20...3.22.
..31.22.122..2.0....
..2...3...1.123321..
.2...2....2....113..
3..2.2.3.3..1..2.1.1
.2..33..0.32.322.2..
