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C₄ and C₆ (in scientific pitch notation) is a fifteenth.
:{\override Score.TimeSignature
#'stencil = ##f \relative c' { \time 4/4 \set Score.tempoHideNote = ##t \tempo 1 = 20 1 }}

It is referred to as a fifteenth because, in the diatonic scale, there are 15 notes between them if one counts both ends (as is customary). Two octaves (based on the Italian

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