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solid-fuel × 77rockets × 27
fuel × 11
launch × 9
propulsion × 8
amateur-rocketry × 8
liquid-fuel × 7
booster × 6
space-shuttle × 5
history × 5
engine-design × 5
launch-vehicle × 5
srb × 5
engines × 4
hybrid-rocket × 4
thrust × 3
stages × 3
oxidizer × 3
orbital-mechanics × 2
spacecraft × 2
orbital-maneuver × 2
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