% heyawake 291 by Tom Collyer, http://www.janko.at/Raetsel/Heyawake/291.a.htm
heyawake
hard-
10 10
+---+-------+-------+
|3..|3......|3......|
|...|.......|.......|
|...|.......|.......|
|...+---+---+---+---+
|...|1..|1......|3..|
|...|...|.......|...|
|...|...|.......|...|
+---+---+---+---+...|
|3..|1..|2..|...|...|
|...|...|...|...|...|
|...|...|...|...|...|
|...|...+---+...+---+
|...|...|3..|...|3..|
|...|...|...|...|...|
|...|...|...|...|...|
+---+---+...|...|...|
|3......|...|...|...|
|.......|...|...|...|
|.......|...|...|...|
+-------+---+---+---+
