% nurikabe 410 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/410.a.htm
nurikabe
medium-
12 9
...7...4.3..
....4.......
..........4.
.......2....
..4.1...3...
............
.3.....3....
.....2..5..4
.4..........
