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