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