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6
7
4
3
3
2
3
6
4
7
2
9
3
5
4
5
9
2
6
4
7
3
8
4
2
1
8
4
7
6
2
8
1
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6
3
7
4
3
3
2
6
4
7
2
5
9
4
9
2
7
3
3
5
4
6
8
4
6
2
8
4
2
7
1
1
8
1
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5
6
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8
9
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