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Source:
p. 28, b. 621-640
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A sharp raising c2 to c
2 appears in FE (→GE1→GE2,→EE1→EE2) only just before the 4th quaver of the bottom voice. Chopin would write an accidental too late on a few occasions (e.g. in the Etude in F Major, Op. 10 No. 8, bar 43). An accidental at the beginning of the bar was added in EE3 and GE3, yet it was only GE3 that removed the 
in the middle of the bar, unnecessary in this situation.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Errors in FE, GE revisions, Omission of current key accidentals
notation: Pitch
Missing markers on sources:
GE1, GE2, FE1, FED, FEH, FEJ, FES, GE3, EE1, EE2, EE3, Atut, GE2a, FEFo