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