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