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