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