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