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