% heyawake, nikoli sample problem 6 by Yuichi Saito
heyawake
medium
18 10
+---+-------------+-----------+-+---+
|2..|3............|...........|.|2..|
|...+-------+-----+-----------+.|...|
|...|3......|5................|.|...|
|...|.......|.................+-+---+
|...|.......|.................|3....|
+---+.......+---------+---+---+.....|
|2..|.......|3........|2..|3..|.....|
|...+---+---+---+-----+...|...|.....|
|...|2..|4..|...|2....|...|...|.....|
|...|...|...|...|.....|...|...|.....|
|...|...|...|...|.....|...|...|.....|
+---+...|...|...+-----+---+-+-+-----+
|2..|...|...|...|3....|2....|.|3....|
|...|...|...|...|.....|.....|.|.....|
|...|...|...|...|.....|.....|.|.....|
|...+---+-+-+-+-+-----+-----+-+-----+
|...|2....|1..|3......|.......|2....|
|...|.....|...|.......|.......|.....|
|...|.....|...|.......|.......|.....|
+---+-----+---+-------+-------+-----+
