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