% nurikabe 647 by Tom Collyer, http://www.janko.at/Raetsel/Nurikabe/647.a.htm
nurikabe
medium-
18 10
.........1........
5..........1.1..5.
.5....5........5..
...2.....2........
....5.....5.......
.................2
.5.5...........5..
.......5...5......
..........2.1.....
.....2............
