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