% nurikabe 457 by Grant Fikes, http://www.janko.at/Raetsel/Nurikabe/457.a.htm
nurikabe
medium-
24 14
.......5......5.....2.3.
........................
.....2........7.....3.7.
........................
7.............2.........
........2....2.........5
5.2....3...7.....b......
....b....2..............
...2.......2....5......3
......3.....5...........
..................3.....
..7..2.................2
............b.........3.
3.......5...............
