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

Crossword clues for Drinkers may run them 4 letters:

TABS: Drinkers may run them
BARTABS: Drinkers may run them
TAB: Drinkers may run one up
BARTABS: Drinkers may run them up
TAB: A drinker may run one