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