% nurikabe 220 by ooya, http://www.janko.at/Raetsel/Nurikabe/220.a.htm
nurikabe
medium-
17 17
.5..5...5.......3
..6..............
.........3..1...2
.................
.3......7......3.
.......4....6....
2...1............
......2...1..2...
........3........
..2..6.....5..5..
...............5.
....2..1....2....
..2...........1..
.6...1...2.......
............9...4
.1....4..........
..4...........1..
