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Op. 10 No 2, Etude in A minor

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b. 23

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

Three-note chord in CLI & Ap

Four-note chord in FE (→GE,EE)
..  

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 24

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

g1-d2 in CLI

d2 in Ap & FE (→GE,EE) 
..

The additional g1 in CLI is certainly the original version, Chopin rejected this note both in Ap and in the base text for FE. Cf. bars 20 and 22. 

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes

b. 24

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

..

We add cautionary naturals before the G-g octave. The addition was also performed in GE4 (→GE5).

category imprint: Differences between sources; Editorial revisions

b. 25-26

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

Triads in CLI & Ap

Sixths in FE (→GE,EE) 
..

The additional c3 notes, visible in CLI and Ap at the beginning of these bars in the lower voice, were deleted by Chopin in FEcor. In FE in bar 25 a  was left before the empty space after the deleted note, which the reviser of GE moved before f3.

category imprint: Differences between sources

issues: Accompaniment changes , Authentic corrections of FE

b. 25

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

..

In FE, before the empty space after the deleted c3 note, a  was inserted, which was moved by the reviser of GE before f3. In EE2 (→EE3) the sign was removed, yet in EE4 a  was added before f3, probably after noticing it in GE.

category imprint: Differences between sources

issues: EE revisions , Inaccuracies in FE , GE revisions