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