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