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