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