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