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