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Source:
p. 4, b. 33-44
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The three-note chord in FE is the original version, which is proved by the visible deletion of the b
1 note in GC. At the time of introducing this correction, Chopin did not check the notation of the accidentals – the 
overlooked on the 2nd beat of the bar was added only in GE.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Errors resulting from corrections, GE revisions, Authentic corrections in GC
notation: Pitch
Missing markers on sources:
GC, FE1, FE2, FED, FEJ, FES, GE1, GE1a, GE2, GE3, EE1, EE2, EE3