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

Crossword clues for Periods immediately before 4 letters:

EVES: Periods immediately before
EVE: Period immediately preceding
AUGHTS: Period immediately following Y2K
PASSIONWEEK: Period immediately before Easter
RUNUPS: Immediately preceding periods
ARGON: Element immediately below neon on the periodic table