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