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