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

Crossword clues for Certain layers:

III: MPEG-2 Audio Layer _____ (certain file type, formally)
HENS: Certain layers
OZONE: Certain layer
HEN: Certain layer
WAFER: Certain snack layer
OZONE: Certain atmospheric layer