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b. 29

composition: Op. 10 No 2, Etude in A minor

..

In CLI and FEcor there is no  returning e2 on the 8th semiquaver in the bar. The sign was added in a later proofreading of FE (→GE,EE); it is also present in Ap.

category imprint: Interpretations within context; Differences between sources

issues: Authentic corrections of FE , Errors of CLI

b. 29

composition: Op. 10 No 2, Etude in A minor

..

We add a cautionary  before g2.

category imprint: Editorial revisions

b. 31

composition: Op. 10 No 2, Etude in A minor

a1 repeated in CLI & FEcor

a1 sustained in Ap

No a1 in FE (→GE,EE)  

..

Chopin removed a1 on the 2nd beat in the bar in a later proofreading of FE (→GE,EE). The inconvenience of the repetition present in the original version was also removed in Ap.

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 31

composition: Op. 10 No 2, Etude in A minor

..

In CLI and Ap the 7th and 15th semiquavers are written as a1. At the same time, the notation of Ap is faultless, whereas in CLI there is no  returning a1 on the 4th beat of the bar. The latter also appears in FEcor, in which Chopin added the , yet only before the last note. It was moved to the correct position only in a later proofreading of FE (→EE2EE3), which, eventually, displays an entirely correct text.
In GE and EE4 further revisions concerning this section (from the 7th semiquaver to the end of the bar) were performed, adding or removing cautionary accidentals. The modifications do not change the meaning of the text, they only influence its transparency.  

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Enharmonic corrections , Authentic corrections of FE

b. 31

composition: Op. 10 No 2, Etude in A minor

..

Neither in CLI nor in Ap there are cautionary naturals before the 2nd crotchet in the L.H. Chopin would add signs at different stages of the Etude's publication preparations – before in the base text for FE, before in a later proofreading.

category imprint: Differences between sources

issues: Cautionary accidentals , Authentic corrections of FE