The c note in JC is most probably the copyist's error, which is revealed by d which is present both in EF and PE. In the two remaining similar phrases (bars 62-63 and 74-75), the chord on which the second bar is based differs significantly from the chord in the first bar; adopting the c note as the bass note would reduce the difference mainly to the omission of e
1, which does not seem to change the harmonic content.
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category imprint: Differences between sources
issues: Errors of JC
notation: Pitch