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Source:
p. 1, b. 1-16
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In A (→FE) and CGS there is no accidental before the bottom note of the last R.H. crotchet. Therefore, it should be interpreted as an a
1, which must be a mistake. A 
was added by Fontana in FC (→GE) and by the reviser of EE. The accidental was also added in FED (with Chopin's hand) and FES.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Annotations in teaching copies, EE revisions, Annotations in FED, Omissions to cancel alteration, Errors of A, Annotations in FES, Fontana's revisions, Errors repeated in FE
notation: Pitch
Missing markers on sources:
CGS, A, FC, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, GE3, EE1, EE2, CXI, EE1a