% nurikabe 172 by ooya, http://www.janko.at/Raetsel/Nurikabe/172.a.htm
nurikabe
medium-
18 10
3........1.......5
........3..3...3..
..............1...
1...1....3...9.1..
.......5..........
9...3......1......
...1.............3
7...5........1....
..........5.......
....5..........3..
