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

Crossword clues for Opening on a staff:

TENORCLEF: Staff opening
CLEFS: Staff openings?
CLEF: Staff opening
REST: Staff opening?
BASSCLEFS: Some staff openings
TREBLECLEF: Staff opening
CLEF: Opening on a staff