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

Crossword clue for "RULEONE"

RULEONE: Principal principle; Most important guideline; The most important principle; First order; The first requirement; The first thing you must know ...; Starting guide; The primary instruction; Prime directive; First thing to know about our club: . . .; For Fight Club, it's "You do not talk about Fight Club"