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