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B
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0
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0
 
 
B
R
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X
 
0
0
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0
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0
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0
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0
 
 
B
R
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0
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0
0
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0
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0
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B
R
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0
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0
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0
0
0
0
0
0
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B
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0
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0
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B
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0
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B
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0
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0
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B
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0
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B
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0
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B
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0
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B
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0
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B
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0
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B
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0
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B
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0
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0
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B
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X
 
0
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0
0
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0
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B
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0
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0
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B
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0
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0
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0
0
0
 
 
B
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