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The Raptor engine is the first full-flow staged combustion cycle engine to every fly. https://en.wikipedia.org/wiki/Staged_combustion_cycle#Full-flow_staged_co

• anticensor 7y ago
  The word you have looked for is ever, not every.
  • colordrops 7y ago
    It's clearly an unintentional typo, and also not possible to confuse for something else.