*-----------*
|...|.4.|7.5|
|67.|2..|.4.|
|...|6.5|..2|
|---+---+---|
|4..|.9.|...|
|..2|8.7|5..|
|...|.1.|..7|
|---+---+---|
|8..|4.6|...|
|.4.|..3|.59|
|5.3|.8.|...|
*-----------*