% heyawake 220 by mimic, http://www.janko.at/Raetsel/Heyawake/220.a.htm
heyawake
very hard
36 20
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+---+.....|...|.....|...|...|...+---+---+.....+-----+-----+-----+---+...|
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+---+.........|.........|...|...|...|...|.....|.....|.....|.....|...+---+
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+---+.....+---+...+---+-----+.|.....|.......|.....|...+-----+---+-+-+---+
|2..|.....|...|...|...|4....|.|.....|.......|.....|...|4....|2....|2....|
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+---+-----+---+---+---+-----+---+---+-----+---+-------+-----+-----+-----+
