% slitherlink 90 by Hirofumi Fujiwara, http://www.janko.at/Raetsel/Slitherlink/090.a.htm
slitherlink
very hard
30 20
.221.3...1..2.131.31..21..3...
.21.2233..1.....1120..2.....3.
1..1....2210313.....1.3......2
2...10..331..1...2....3.312.3.
..3...22..1.0.1.1.....22....32
.2..0.22.1...2....13.3....3...
3.....301..1.0.3.1..0312.1..22
13.1.1.....0.2210..3.....332..
...0...2.21..........2.2.110.3
21.3..1..3.0121.32.0.3..11..2.
..121211..2.....21.12...1.3.31
1.......2.13211.3.2..31...1..2
1220...32.1.....210....21.13..
...2.1.1..112.2......31.....1.
1...31.0113..1..1.2021.0....2.
3..2...132.....21.1....3.032.1
..3.22..1...1312...3......2...
21.1...2..2.0..13.2.013.2122..
..0.3.3.212.......2.1.3.2..133
1.3..22.223.201.12..1....1....
