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