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