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Source:
p. 2, b. 29-56
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b. 36
In As one can see that before the 2nd quaver of the lower R.H. voice a was initially entered. Chopin then changed it to a and probably added a cautionary one before the a in the L.H. The accidental in the R.H. is also present in the version prepared for publication.
Compare the passage in the sources»
category imprint: Corrections & alterations; Source & stylistic information
issues: Main-line changes
notation: Pitch
Missing markers on sources:
FE1, FE2, FES, GE1, GE2, GE3, EEW, As