% nurikabe 372 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/372.a.htm
nurikabe
medium-
13 13
4.......4...2
.............
2....5.....2.
.......1.2...
4...3.....5..
......1..2...
..1..........
...2.3.......
2........2.4.
........4....
..1..3......2
......1......
...7.......4.
