1 2 3 4 5 X 7 8 9
4 5 6 7 8 X 1 2 3
7 X X X X X X X X
2 3 X X X X X X X
5 6 7 8 9 X 2 3 4
8 X 1 2 3 X 5 6 7
6 7 8 9 1 X 3 4 5
9 1 2 3 4 X 6 7 8
3 4 5 6 7 X 9 1 2