% nurikabe 426 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/426.a.htm
nurikabe
medium-
13 13
..........5..
5..1.....1...
.....2.......
......4....4.
5........2...
...5.........
2......4....3
..1...1......
........3...3
.............
3.4.........3
......3......
..3.2..4....1
