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