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