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Use "clefs" in a sentence
"Pitches represented by lines and spaces of a staff, the higher the line, the higher the pitch represented, signs called clefs at the beginning of each staff making clear the pitch names of the lines and spaces."
"She brings to mind, of all things, a girly Dashboard Confessional, another artist enamored of ardent, beefed-up acoustic roman à clefs."
"I told her of my problem and she quickly and non-disdainfully explained it, showed me about clefs and half steps and the like."