*-----------*
|.1.|9..|54.|
|...|..2|...|
|.87|13.|.9.|
|---+---+---|
|..8|...|..9|
|97.|8.3|.24|
|4..|...|3..|
|---+---+---|
|.5.|.71|93.|
|...|4..|...|
|.91|..5|.7.|
*-----------*