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