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cryogenics × 62fuel × 15
rockets × 13
liquid-fuel × 12
lox × 10
spacex × 8
engine-design × 6
sub-cooled × 6
falcon-9 × 5
space-shuttle × 5
propulsion × 5
thermal × 4
hydrogen × 4
fuel-system × 4
spacex-starship × 3
design-alternative × 3
isro × 3
oxygen × 3
helium × 3
methane × 3
launch × 2
engines × 2
design × 2
materials × 2
engineering × 2