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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Engine's output:

URLS: Engine output
HUM: Well-tuned engine output
ROAR: Jet engine's output
MECHANICALPOWER: Engine's output
EXHAUST: Output from an engine
WEBHITS: Output of some engines
CODE: Output from some engineers