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