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