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Source: 
p. 2, b. 17-32
p. 1, b. 1-16
p. 2, b. 17-32
p. 3, b. 33-50
p. 4, b. 51-67
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AI - Working autograph
A - Autograph
FE - French edition
FE1 - First French edition
FE2 - Corrected impression of FE1
FED - Dubois copy
FEJ - Jędrzejewicz copy
FES - Stirling copy
GE - German edition
GE1 - First German edition
GE2 - Second German edition
GE3 - Third German edition
GE4 - Fourth German edition
EE - English edition
EE3 - Corrected impression of [EE2]
EE4 - Revised impression of EE3
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AI - Working autograph
A - Autograph
FE - French edition
FE1 - First French edition
FE2 - Corrected impression of FE1
FED - Dubois copy
FEJ - Jędrzejewicz copy
FES - Stirling copy
GE - German edition
GE1 - First German edition
GE2 - Second German edition
GE3 - Third German edition
GE4 - Fourth German edition
EE - English edition
EE3 - Corrected impression of [EE2]
EE4 - Revised impression of EE3
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  b. 21-23

The sources are missing some of the flats before g notes (in various octaves). None of these inaccuracies raise any doubt concerning the sound intended by Chopin. In AI there are no  before g, as well as before G and g1 in bar 23. In A both flats in the L.H. in the 2nd half of bar 22 are missing; only the first of them was added in FE. The remaining sources have the correct text. 

Compare the passage in the sources»

category imprint: Interpretations within context; Differences between sources

issues: EE revisions, Accidentals in different octaves, Inaccuracies in FE, GE revisions, Omission of current key accidentals, Authentic corrections of FE, Inaccuracies in A

notation: Pitch

Missing markers on sources: FE1, A, AI, FE2, FED, FEJ, FES, GE1, GE2, GE3, GE4, EE3, EE4