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

Crossword clue for "REFS"

REFS: some who whistle while they work; penalty assessors; whistle blowers; officials showing 50-Across, informally; dictionaries, thesauruses, etc., informally; play checkers, informally; ones calling offsides; n.B.A. whistle blowers; see 58-Across; almanacs and atlases, for short