Questions on 'nasa' tag
0
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32
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28
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0
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0
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28
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0
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0
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345
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1
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375
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0
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1
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406
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0
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1
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343
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1
answer
407
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1
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433
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1
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597
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1
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568
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1
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507
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0
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1
answer
863
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