% nurikabe 251 by The Zotmeister, http://www.janko.at/Raetsel/Nurikabe/251.a.htm
nurikabe
medium
20 20
....................
.2..3.3...1.......1.
....................
.3.....1....3...d...
.........4..........
....2.......2.7.....
..3.....6.........4.
...........5........
...3....7...1...3...
....................
....4...7.2....3..1.
.2.......5.2........
..............1...2.
.6.....6....9..7....
....................
.....3............1.
...4................
...............3.3..
....2..2.....2..1...
....................
