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