% nurikabe 431 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/431.a.htm
nurikabe
medium-
12 12
.....3...4.5
............
.....4......
3.3.....3...
.1.1........
......3.2...
4...1......3
..2.....2...
....1.......
...1.4...2..
.4..........
...5.......2
