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the; the an; the an; / /; /
state country nation space
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One year before the Columbia disaster. One year after the Columbia disaster. Immediately after the Columbia disaster. Years before the Columbia disaster.
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One year before the Columbia disaster. One year after the Columbia disaster． Immediately after the Columbia disaster. ‘ Years before the Columbia disaster．
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he had to fly he could fly can he fly could he fly
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fly；flight flying；flight fly；fly flight；fly
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