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b. 24
A cautionary before B occurs in all sources except As. We also add an accidental before the lower note of the octave in the main text.
As has no sharps raising d-d1 to d-d1. It is certainly a sketchy notation and not a variant.
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category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Cautionary accidentals, Omission of current key accidentals
notation: Pitch