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