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