*-----------*
|...|.9.|..5|
|...|..3|62.|
|.76|.12|..8|
|---+---+---|
|.9.|.26|...|
|1..|9.4|..2|
|...|35.|.6.|
|---+---+---|
|7..|26.|18.|
|.21|4..|...|
|5..|.3.|...|
*-----------*