% heyawake 257 by Mokuani, http://www.janko.at/Raetsel/Heyawake/257.a.htm
heyawake
easy+
10 10
+-----+-----+---+---+
|2....|2....|3..|2..|
|.....|.....|...|...|
|.....|.....|...|...|
+-----+-+---+...|...|
|0......|...|...|...|
|.......|...|...+---+
|.......|...|...|...|
+---+---+-+-+---+...|
|...|2....|3....|...|
|...|.....|.....|...|
|...|.....|.....|...|
|...+---+-+-+---+---+
|...|1..|...|2......|
+---+...|...|.......|
|2..|...|...|.......|
|...|...+---+-+-----+
|...|...|3....|2....|
|...|...|.....|.....|
|...|...|.....|.....|
+---+---+-----+-----+
