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