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