% nurikabe 539 by Adolfo Zanellati, http://www.janko.at/Raetsel/Nurikabe/539.a.htm
nurikabe
medium-
10 10
..3......3
....3.....
..2....4..
...1.....4
..1.......
.5.....3..
....3...3.
.....1....
.......4..
.3...4....
