Issues : Errors repeated in FE

b. 33

composition: Op. 28 No. 17, Prelude in A♭ major

..

In A (→FE) there are only 3 flats before the 1st chord – e2c2 in the R.H. and a1 in the L.H. In FC and EE1 lowering c1 to c1 and a cautionary one before a were added, while in GE and EE2 a cautionary  before e1 was also added.
The necessary  lowering c1 to c1 was added in FED.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Annotations in FED , Accidentals in different octaves , Cautionary accidentals , Fontana's revisions , Inaccuracies in A , Errors repeated in FE

b. 38

composition: Op. 28 No. 17, Prelude in A♭ major

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In A (→FE) the top R.H. voice crotchets are devoid of dots. It must be Chopin's oversight – cf. analogous b. 6 and 14. Dots are in FCI as well as in FC (→GE) and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors of A , Fontana's revisions , Errors repeated in FE

b. 44-46

composition: Op. 28 No. 17, Prelude in A♭ major

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In A (→FC,FE) accidentals were inserted very inaccurately – in total, 4 sharps and 12 naturals are missing – which, however, does not impede the determination of the correct text. Accidentals were being added in GE and EE, although it is only in EE2 that the notation is totally correct. The naturals before the b-b1 octave in b. 44 were also added in FED.
Interestingly enough, the notation of FCI is more accurate than the one of A – only one  and 5 naturals are missing.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Annotations in FED , Accidentals in different octaves , Errors in GE , GE revisions , Omission of current key accidentals , Inaccuracies in A , Errors repeated in FE , Errors repeated in EE

b. 47-50

composition: Op. 28 No. 17, Prelude in A♭ major

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As in the previous four-bar section, accidentals in A (→FE) are written inaccurately – 9 sharps are missing. In FC Fontana added one of them, yet overlooked the  before the middle note of the 2nd L.H. quaver in b. 47. A comparable number of deficiencies are to be found also in FCI. The oversights are obvious, and the majority of the accidentals were supplemented in GE and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of FC , Fontana's revisions , Inaccuracies in A , Errors repeated in FE