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

Crossword clues for Klingons and Vulcans:

ALIENS: Klingons and Vulcans
ALIEN: Klingon or Vulcan
ETS: Vulcans or Klingons, for short
ALIENRACE: Klingons or Vulcans, e.g.