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the solution:
9
8
1
5
7
3
6
4
2
7
5
6
4
2
9
8
1
3
4
2
3
8
6
1
7
5
9
8
6
5
7
3
2
1
9
4
1
7
9
6
5
4
2
3
8
2
3
4
1
9
8
5
7
6
6
4
8
9
1
7
3
2
5
3
9
7
2
8
5
4
6
1
5
1
2
3
4
6
9
8
7