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