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b. 73-82

composition: Op. 35, Sonata in B♭ minor, Mvt III

a1 & f1 in chords in GC (→GE1) & FE (→EE1)

a1 (with cautionary ) & f1 in GE2mar (→GE2) & EE2

No a1 & f1 in chords in FES

..

FES deleted the top notes of the chords in bars 73-74 and 81-82, most probably in order to facilitate performance to the pianists with small hands. See bars 19-20.
GE2mar (→GE2) and EE2 added a cautionary  before the first a1 in bars 73 and 81.

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FES

b. 74

composition: Op. 35, Sonata in B♭ minor, Mvt III

..

Similarly as in bar 20, due to Chopin's mistake in [A], the correct notation of the trill appeared in the editions – despite the proofreading of FE3 – only in GE2 and EE2. The mistake was corrected in all pupil's copies.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FED , Errors in EE , Errors in GE , GE revisions , Annotations in FES , Authentic corrections of FE , Annotations in FESch

b. 76

composition: Op. 35, Sonata in B♭ minor, Mvt III

f in chord in GC (→GE), FE4, FES & FE5

No f in FE1 (→FE2FE3,EE)

..

In the chord on the 4th beat of the bar in FE1 (→FE2FE3,EEf was overlooked, the bottom note in the R.H. A respective correction was introduced in FE4 and FE5, as well as in FES.
FE4 and FES overlooked the dot extending the added f.

category imprint: Differences between sources; Corrections & alterations

issues: Annotations in teaching copies , Errors in FE , Annotations in FES , Authentic corrections of FE , FE revisions

b. 78

composition: Op. 35, Sonata in B♭ minor, Mvt III

..

FE1 overlooked the  raising a to a. The mistake was corrected already in FE2.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , FE revisions

b. 82

composition: Op. 35, Sonata in B♭ minor, Mvt III

..

Similarly as in bar 20, due to Chopin's mistake in [A], the correct notation of the trill appeared in the editions – despite the proofreading of FE3 – only in GE2 and EE2. The mistake was corrected in FESch and FES.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Errors in EE , Errors in GE , GE revisions , Annotations in FES , Authentic corrections of FE , Annotations in FESch