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