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