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