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