% nurikabe 551 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/551.a.htm
nurikabe
medium-
10 10
3....5....
...3......
.3........
.........4
..........
..5..6...3
.3..1.4...
..........
..........
..3.2.4...
