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

Crossword clues for Microwave's signal:

DING: Microwave signal, sometimes
BEEPS: Microwave signals
BEEPS: Signals from microwaves
BEEP: Microwave's signal
BEEP: Microwave oven's signal
BEEPED: Signaled completion, as a microwave