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b. 1

composition: Op. 25 No 2, Etude in F minor

..

In AT, AW and CDP, there is no cautionary flat before the 4th crotchet (b). It may mean that Chopin added the sign in [A], at the time of preparing the Etude for print, shortly before giving [A] for copying. 

category imprint: Differences between sources

issues: Cautionary accidentals

b. 3

composition: Op. 25 No 2, Etude in F minor

..

Chopin hesitated whether to put cautionary flats before d1 and d3. The signs are included in the earliest source (AT) and in the published version, including GC (→GE), FE and EE. In turn, in CDP there is only the second of them, while AW included the first one (in the L.H.), yet Chopin eventually deleted it. Despite this fact, in the main text we give exactly this , returned in the later sources and, according to us, justified.

category imprint: Differences between sources; Corrections & alterations

issues: Chopin's hesitations , Cautionary accidentals , Deletions in A , Last key signature sign

b. 4

composition: Op. 25 No 2, Etude in F minor

..

In AW, GC, FE and EE1 (→EE2), there is no  returning b2. This characteristic for Chopin mistake was corrected in the remaining sources. In the repetition of this phrase in bar 23 the error appears only in AW, in which the repetition is not written with notes.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , GE revisions

b. 7

composition: Op. 25 No 2, Etude in F minor

..

AT, AW and CDP do not have here the  before the 5th (e2) quaver. In AW and CDP, the inaccuracy is also in bar 26, while in CDP also in bar 57. 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Errors of A , Errors of CDP

b. 8

composition: Op. 25 No 2, Etude in F minor

a2 in AT, AW, CDP, GC (→GE), FE & EE2 (→EE3)

b2 in EE1

..

The version of EE1 is almost certainly erroneous.

category imprint: Differences between sources

issues: EE revisions , Errors in EE