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j-2 × 10saturn-v × 4
engines × 3
ssme × 3
fuel × 2
engine-design × 2
nozzle × 2
upper-stage × 2
rl-10 × 2
launch × 1
space-shuttle × 1
propulsion × 1
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sls × 1
specific-impulse × 1
calculation × 1
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