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