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