Issues : Errors in FE

b. 83

composition: Op. 25 No 10, Etude in B minor

f-a in GC (→GE) & EE

a in FE

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Lack of the f note in FE is a possible mistake – it is hard to assume that Chopin performed a correction here and did not notice both the missing  before the crotchet and the mistake in the previous bar.

category imprint: Differences between sources

issues: Errors in FE

b. 83

composition: Op. 25 No 10, Etude in B minor

..

In GC and FE there is no  lowering a to a. The mistake was corrected in GE, EE also includes the correct text. The natural was also added in FED.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , Errors in FE , Annotations in FED , GE revisions , Errors of GC

b. 108

composition: Op. 25 No 10, Etude in B minor

f1 in GC & GE1 (contextual interpretation), EE & GE2 (→GE3)

a1 in FE

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FE has an aas the 3rd crotchet of the middle voice in the R.H. It is almost certainly the so-called Terzverschreibung error.
In GC (→GE1) the correct note is an f1. This patent error was corrected in GE2 (→GE3), EE also includes the correct version.

category imprint: Differences between sources

issues: Errors in FE , Omissions to cancel alteration , Errors in GE , Terzverschreibung error , GE revisions , Errors of GC

b. 108

composition: Op. 25 No 10, Etude in B minor

Octave in GC (→GE1)

Chord in FE, EE & GE2 (→GE3)

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Lack of the middle note on the 3rd beat of the bar is almost certainly a mistake of GC (→GE1).
In FE the note is present, yet there is no  returning F. EE and GE2 (→GE3) have the correct text.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Omissions to cancel alteration , GE revisions , Errors of GC