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