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