Issues : Errors of A
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b. 7
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composition: Op. 10 No 2, Etude in A minor
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In Ap there is no category imprint: Differences between sources issues: Omissions to cancel alteration , Errors of A |
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b. 19-20
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composition: Op. 10 No 2, Etude in A minor
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In none of the authentic sources the notation of the accidentals in the part of the R.H. is entirely correct in these bars – particularly in bar 19. However, the inaccuracies do not pose problems in establishing the correct text. Moreover, in all sources except for Ap the unnecessary category imprint: Interpretations within context; Differences between sources issues: EE revisions , Errors in FE , Accidentals in different octaves , Omissions to cancel alteration , GE revisions , Errors of A , Authentic corrections of FE , Errors of CLI |
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b. 26
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composition: Op. 10 No 2, Etude in A minor
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Ap is missing a category imprint: Interpretations within context issues: Accidentals in different octaves , Errors of A |
returning a2 at the 9th semiquaver of the bar. It must have been Chopin's oversight. 
before f
next to the lower note of the octave at the beginning of the bar. This patent error is one of a few inaccuracies of this autograph's notation.