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b. 29-31

composition: Op. 10 No 10, Etude in A♭ major

..

In FE (→GE,EE) these bars are written with four sharp key signatures, as a result of which in each bar notes must be provided with accidental naturals. It is probably an error of the engraver, perhaps relying on the previous section in E major (bars 17-22). Similarly in bars 32-34. 

category imprint: Differences between sources

issues: Errors in FE , Authentic corrections of FE

b. 32-34

composition: Op. 10 No 10, Etude in A♭ major

..

In FE (→GE,EE) these bars – same as bars 29-31 – are written with four sharp key signatures, as a result of which in each bar notes must be provided with accidental naturals. In FE the  before d3 in bar 32 was omitted.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , GE revisions , Authentic corrections of FE

b. 35-36

composition: Op. 10 No 10, Etude in A♭ major

..

The 2nd halves of these bars are briefly written in A – with the help of the / mark – as repetition of the 1st halves. 

category imprint: Source & stylistic information

issues: Abbreviated notation of A