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