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