% nurikabe 377 by Otto Janko, http://www.janko.at/Raetsel/Nurikabe/377.a.htm
nurikabe
medium-
13 13
.5.....5.....
..3.....3....
..........1..
.....2......6
.......4...1.
3...2........
........3....
1.....2.....2
..2.....3....
.............
..5...2.....5
.............
4...3...3...4
