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