% nurikabe 440 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/440.a.htm
nurikabe
medium-
13 13
2..3........3
.......1..2..
2..3.........
.........1.3.
2..1...4..3..
........2....
....1.......2
4.....3......
.............
3....4......5
.......5.....
2.2.........2
....2..3..1..
