% slitherlink 710 by Grant Fikes, http://www.janko.at/Raetsel/Slitherlink/710.a.htm
slitherlink
very hard
36 20
.1221..2022..1222232231..1222..3233.
1....1..2...2..........3...3..2....3
..11..2.3..2..22222103..3..3.2..32..
.3..1.1...2..2........1..0...2.2..1.
.2..0.3..2..2..222213..3..3..2.0..3.
..23..1.3..2..3......3..2..1.1..11..
1....1..3.2..1..1311..1..1.3..3....2
.2333...1.2.3..2....1..2.2.1...3111.
......1.2.2.2.3..23..2.1.2.2.2......
0.1.1.3.1.2.3.0.3..1.3.1.2.0.2.0.2.2
2.1.2.2.2.2.2.2.3..1.3.2.2.1.2.1.1.2
......1.1.3.2.2..33..3.2.1.1.1......
.0311...1.3.2..1....2..1.2.0...1133.
3....2..2.2..2..2111..3..2.3..3....0
..21..3.0..3..2......1..2..2.1..32..
.0..2.3..3..0..111322..1..3..0.2..1.
.3..3.3...1..2........2..1...2.1..1.
..21..1.2..2..32113113..1..2.2..10..
2....2..3...2..........3...0..2....3
.2223..1310..3222201111..1212..3110.
