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