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

Crossword clues for Well lah-di-dah for you!:

MUSTBENICE: Well lah-di-dah for you!
OOHFANCY: Well, lah-di-dah!
ARENTYOUSOSMART: Well, lah-di-dah, just try out for Jeopardy! already...