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