% nurikabe 108 by ooya, http://www.janko.at/Raetsel/Nurikabe/108.a.htm
nurikabe
hard-
17 17
.........4.......
.a.5.............
.........a.......
4................
........6........
...............4.
.....1.....2.5...
...3....5........
4.....2...2......
....5......1.....
3.3..............
.....5..3........
.......1......7..
.................
..2.1..1.........
...5.....4.......
......2....b.5.2.
