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