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