Harvard sentence
 n.— «Verizon uses Harvard sentences—phonetically-balanced sentences developed by electrical engineers—to test signal quality. These special sentences use specific phonemes at the same rate they appear in English.» —“A drive around town asking, ‘Can you hear me now?’” by Kate Carroll in Princeton University Daily Princetonian (N.J.) Mar. 17, 2006. (source: Double-Tongued Dictionary)

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