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