% nurikabe 12 by Warai Kamosika, http://www.janko.at/Raetsel/Nurikabe/012.a.htm
nurikabe
medium-
18 10
7.......3..2..1...
..................
3...1..1.....1....
......2..2..7..2.5
6.......5.........
...2.....1........
..3...............
.......3.....2....
...............2..
4....5...2...2..b.
