% nurikabe 639 by Mokuani, http://www.janko.at/Raetsel/Nurikabe/639.a.htm
nurikabe
medium-
17 17
..4...........1.3
....5.....3......
.6.3.i...1.5.....
.................
..............1..
............2..9.
......3..........
...1........4....
7...1...1..2..9..
.................
..........1......
...1.............
...............1.
.......i.5....1..
.1.2....2......6.
......1..........
..3..3....1......
