*-----------*
|.8.|12.|9..|
|.1.|59.|34.|
|9..|..7|...|
|---+---+---|
|..4|..9|52.|
|8..|...|..9|
|.91|8..|4..|
|---+---+---|
|...|2..|..3|
|.39|.81|.6.|
|..6|.43|.5.|
*-----------*