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