2...7.8.6
..8...4.9
.64.53...
..1..7.9.
...6.5...
.5.9..1..
...73.56.
5.6...2..
7.2.4...3
215479836
378261459
964853721
421387695
897615342
653924187
149732568
536198274
782546913