% heyawake 4 by ?, http://www.janko.at/Raetsel/Heyawake/004.a.htm
heyawake
medium-
10 10
+---+---+---+---+---+
|...|...|...|1..|0..|
+---+...|...|...|...|
|0..|...|...|...|...|
|...|...+---+-+-+---+
|...|...|2....|2....|
+---+---+.....|.....|
|2......|.....|.....|
|.......|.....+-----+
|.......|.....|0....|
+-----+-+---+-+-----+
|.....|1....|2......|
+-----+.....|.......|
|3....|.....|.......|
|.....|.....+---+---+
|.....|.....|1..|...|
+---+-+-+---+...|...|
|...|...|...|...|...|
|...|...|...|...+---+
|...|...|...|...|1..|
+---+---+---+---+---+
