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