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