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