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