% slitherlink 341 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/341.a.htm
slitherlink
very hard
20 16
.2...3..3..3..3..3..
3..13.01.22.20.01..1
.2.11..3.1..2..33.02
.31..0..2..3..1..1..
1..2..13.23.12..3..0
.1.13.32.1..23.12.2.
..0..1.....1.....3..
2..21.1..23.22.22.03
31.12.11.12..2.23..2
..1.....3.....2..3..
.3.11.22..0.33.21.1.
3..1..31.21.12..3..3
..3..0..1..1..3..12.
33.31..1..2.3..13.1.
1..21.32.11.02.21..1
..3..3..3..1..3...1.
