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