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