% nurikabe 640 by Mokuani, http://www.janko.at/Raetsel/Nurikabe/640.a.htm
nurikabe
medium-
17 17
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.2..........e.f..
4.....4..........
....4.....4......
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.......2....3....
.5...4...........
..5......1.......
............2....
....1..2...2.....
..2..............
......3..........
6..............1.
....1........1..3
..6.......9......
........4..3.....
1...4..3.......1.
