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