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

Crossword clues for Spark producer:

ARCED: Produced sparks, as in a microwave
FLINT: Spark producer
FLINTS: Spark-producing stones
FLINTS: Spark producers
FLINT: Spark-producing rock
FLINTS: Spark-producing rocks