% heyawake 25 by ?, http://www.janko.at/Raetsel/Heyawake/025.a.htm
heyawake
hard-
17 17
+-------+-------+-+---+---+---+---+
|2......|3......|.|...|0..|...|2..|
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+-------+-------+.+---+---+---+---+
|4......|.......|.|...|...|2..|...|
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+-------+-------+.+---+---+---+---+
|.......|3......|.|2..|...|...|1..|
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+-------+-------+.+---+---+---+---+
|4......|3......|.|0..|...|2..|2..|
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+-------+-------+-+---+---+---+---+
|...............|.|...............|
+---+---+---+---+-+-------+-------+
|...|1..|...|...|.|2......|1......|
|...|...|...|...|.|.......|.......|
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+---+---+---+---+.+-------+-------+
|...|0..|1..|...|.|3......|3......|
|...|...|...|...|.|.......|.......|
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+---+---+---+---+.+-------+-------+
|...|2..|...|...|.|.......|3......|
|...|...|...|...|.|.......|.......|
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+---+---+---+---+.+-------+-------+
|...|...|0..|1..|.|2......|3......|
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+---+---+---+---+-+-------+-------+
