% nurikabe 219 by ooya, http://www.janko.at/Raetsel/Nurikabe/219.a.htm
nurikabe
medium-
17 17
........7........
.......4........4
..3............4.
4..5...4..2......
.3....4....6.....
.................
................3
2..............3.
.4.........3.....
........4.2......
...7...7.........
..5..............
.............5.5.
............4...2
......4..........
.2...4.......6...
..4...........3..
