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