% slitherlink 189 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/189.a.htm
slitherlink
very hard
30 20
3222322.......3.3..33....3...3
...3.2.3..2.3.2.1.2...23...223
.3...2122.12....32.3.32.122213
2..3.1...21.2.1..1....2...2.23
...2..1.2..2.22.31.2.11.22.2..
3..1.21..3.3.12..3.22.1.2.1..2
2.2.2..2....2..3.12.3.131....1
2.2.0022.3..33..1.2.3.1..2..3.
....2.1.12.2.22...2....11..21.
.22..32...12..22.3.21.13...3.3
.2222.232....2...2....1.2.1213
2...3.....31.2.....12.23..2...
..3...3..3.....2.211321..2..31
....31.1.1.13.2.2...123..0.2.3
1..2.3....311.11322..........3
3..0..1323..2.....32223.3...2.
...213..0...31..2.1..13.1.2...
.3...22..3..3.2.13.212..22.1.1
.13.2...22..31..231....23..2.2
.222..33.13.222....3.23.2...23
