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