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