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

Crossword clues for Alka-Seltzer sounds:

PLOPS: Alka-Seltzer sounds
PLOP: Sound of Alka-Seltzer hitting water
PLOP: Alka-Seltzer hitting water sound
PLOP: Sound in a famous Alka-Seltzer ad