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b. 17

composition: Op. 24 No. 1, Mazurka in G minor

..

In A (→GE1) there is no cautionary  before f1. The sign was supplemented in FE (→EE) and GE2 (→GE3). The addition in FE is probably part of Chopin's proofing of that edition. 

category imprint: Differences between sources; Corrections & alterations

issues: GE revisions , Cautionary accidentals , Authentic corrections of FE

b. 17-21

composition: Op. 24 No. 1, Mazurka in G minor

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Visible in A over the triplet in bars 17 and 21 are erasures that point to corrections made by Chopin in those places.  It is hard to give an obvious explanation as to what was being changed, yet it seems probable that Chopin was removing a numeral and a slur defining the triplet (moving the slur under the triplet and extending it one note further) to insert a motivic long accent instead. 

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A

b. 19

composition: Op. 24 No. 1, Mazurka in G minor

..

We add a cautionary  before e flat1. The sign was already supplemented in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 27

composition: Op. 24 No. 1, Mazurka in G minor

..

We add a cautionary  before e flat1​, which has already been done in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 32

composition: Op. 24 No. 1, Mazurka in G minor

..

We add the numeral for the triplet, already supplemented in GE2 (→GE3).

category imprint: Editorial revisions