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