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Source: 
p. 2, b. 29-56
p. 1, b. 1-28
p. 2, b. 29-56
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FE - French edition
FE1 - First French edition
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FES - Stirling copy
GE - German edition
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GE3 - Corrected impression of GE2
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EEW - First English edition
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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