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b. 12-20

composition: Op. 50 No. 2, Mazurka in A♭ major

..

The cautionary flats before a1 in b. 12 and 20 were added in the first phase of proofreading of FE (→EE). It is unclear whether Chopin was responsible for the entire process of that phase of proofreading.

category imprint: Differences between sources

issues: Cautionary accidentals , FE revisions

b. 16

composition: Op. 50 No. 2, Mazurka in A♭ major

..

In the main text we add cautionary flats before e2 and e1. The latter was already added in the proofreading of FE (→EE), although one cannot be certain whether such additions come from Chopin.

category imprint: Differences between sources; Corrections & alterations

issues: Cautionary accidentals , FE revisions

b. 25

composition: Op. 50 No. 2, Mazurka in A♭ major

..

The cautionary  before e1 was added in the first stage of proofreading of FE (→EE). It is uncertain whether Chopin was responsible for the entire part of that stage of proofreading. The same applies to b. 56 and 100. The accidental is to be found also in GE.

category imprint: Differences between sources; Corrections & alterations

issues: Cautionary accidentals , FE revisions

b. 29

composition: Op. 50 No. 2, Mazurka in A♭ major

2 long accents in A1 

2 short accents in FE (→EE) & GE2

Different accents in GE1

..

Both accents in A1 are undoubtedly long accents, which was not reproduced in FE (→EE). In GE1 it is only the mark in the L.H. that can be considered a long accent; however, according to us, a shorter accent in the R.H. is almost certainly an inaccuracy of notation, even if it was somehow justified in the notation of [A2]. GE2 unified the accents and considered the longer mark in the L.H. to be inaccurate.

category imprint: Differences between sources

issues: Long accents , Inaccuracies in FE , GE revisions

b. 29

composition: Op. 50 No. 2, Mazurka in A♭ major

b-e1-g1 in A1 (→FE) & GE

b-c1-e1 in EE

..

The version of EE is a double Terzverschreibung, committed in FE, in which Chopin corrected it in the last stage of proofreading (it is proven by evident traces of correction in print).

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Terzverschreibung error , Authentic corrections of FE