% nurikabe 73 by ooya, http://www.janko.at/Raetsel/Nurikabe/073.a.htm
nurikabe
medium-
18 10
...4.....1......4.
..........2.......
.........3....9...
..a.......4.......
.........5........
5.........6.......
.........7........
..........8.......
.........9........
..................
