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