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