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1
5
x  1
2
3
x  0
3
1
x  4
4
0
x  9
5
0
x  1
6
2
x  0
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0
x  7
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6
x  1
9
0
x  6
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0
x  4
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8
x  0
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1
x  1
13
8
x  1
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5
x  0
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1
x  3
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2
x  1
17
9
x  1
18
1
x  7
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