% nurikabe 213 by ooya, http://www.janko.at/Raetsel/Nurikabe/213.a.htm
nurikabe
medium-
17 17
3..2......5......
....2...........6
......2......7...
.4...............
..........9...7..
....4............
2............2...
........3.......5
..4....4..4......
...1.............
.............4..2
....4....4.1.....
.2...4....4......
................3
......7........4.
.................
4.2.2.....4....4.
