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

Crossword clues for What's common to the five longest answers:

MISPELLINGS: This puzzle's five longest answers are common ones
USA: What the five longest answers have in common
NNNN: What the five longest answers have in common
INOUT: What the five longest answers have in common
UUUU: What's common to the five longest answers