% heyawake 3 by ?, http://www.janko.at/Raetsel/Heyawake/003.a.htm
heyawake
medium-
10 10
+---+---+---+---+---+
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+---+---+---+---+---+
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+---+---+---+---+---+
|0..|...|...|...|2..|
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+---+---+---+---+---+
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+---+---+---+---+---+
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+---+---+---+---+---+
