% slitherlink 237 by Oleg Andrushko, http://www.janko.at/Raetsel/Slitherlink/237.a.htm
slitherlink
very hard
36 20
3.1..3...2.3..1..0.3...3..1..1..3.1.
...1..2..0...3..2.3..3.1...3..0..0.1
.1.2...0..2..1..3...0.2..1.0...2..1.
0.3..1.1...2..2..0..3...3.3..0.1...3
2...1.3..0.0...3..1..2..0...3.3..3.1
.2..2...1.3..1.0...1..0..3..2...1.3.
..2..3..3...3.1..3.1...1..1..2..2...
...0..3..1..1...0.2..3.3...1..2..3..
.3.2...1..2..0..2...0.2..1.3...3..3.
0.0..1.3...3..2..2..2...0.3..3.3...1
2...3.3..3.1...3..0..0..2...1.3..1.2
.2..3...0.2..2.0...2..3..1..1...3.3.
..2..0..1...3.3..1.3...1..0..2..0...
...0..3..1..3...1.0..3.3...2..3..2..
.1.3...2..0..2..0...0.1..1.0...3..3.
3.2..3.0...2..1..3..3...2.3..0.1...2
2...2.3..1.0...1..1..2..0...3.3..3.3
.1..0...3.3..1.0...1..1..3..2...1.3.
1.1..3..0...0.3..3.3..0...3..3..2...
.3.3..2..3..3...3.0..3..1.2...3..2.3
