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

Crossword clue for "BOXTOP"

BOXTOP: Certain proof of purchase; Proof of purchase, perhaps; Cereal buyer's proof-of-purchase; Old-fashioned proof of purchase; Old-timey proof of purchase; Cereal eater's proof of purchase; Proof of purchase; Proof of purchase for some contests; Proof of purchasing cereal