% nurikabe 158 by ooya, http://www.janko.at/Raetsel/Nurikabe/158.a.htm
nurikabe
medium
24 14
.3...........6......4...
.......4.5...........4..
7.........4............4
.....3.......1..........
4........1.........1....
........2.....6.........
..2......3.....7.......3
5.......4.....8.........
..1......5.....9.....2.5
..............a.........
.2.5......4........2....
........................
.............3..........
...3.4..4.............1.
