% heyawake 108 by Halflength Sleeve, http://www.janko.at/Raetsel/Heyawake/108.a.htm
heyawake
very hard
17 17
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|3....|3..|.....|.......|3..|1|2..|
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+-----+...|.....+-------+...|.+---+
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+-----+...|.....|.......|.....|...|
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+---+-+---+-----+-+-----+.....|...|
|2..|4....|5......|2....|.....|...|
|...|.....|.......+-----+.....+---+
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|...|.....|.......|1....|.....|...|
+---+---+-+---+---+-----+-+---+---+
|4......|4....|...|4....|2|5......|
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+---+---+---+-+-+-+-+---+.+---+---+
|1..|2..|...|2..|...|2..|.|2..|1..|
|...|...|...|...|...|...|.|...|...|
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+---+---+---+---+---+---+-+---+---+
