Lack of the 
before the 6th semiquaver of the bottom voice in AI means that in both bars it is to be a c
1. Knowing the final version, one can doubt whether Chopin simply forgot about the before this note. The use of A as the 5th semiquaver in the L.H. is, however, a strong argument for the authenticity of the literally interpreted version of AI.
In A (→FE→EE2→EE3), there is no before the last note in the R.H., which is a patent inaccuracy of the notation. In GE1 (→GE1a), the sign was completed in bar 74, while in the remaining editions – in both bars.
category imprint: Interpretations within context; Differences between sources; Corrections & alterations
issues: EE revisions, Accidentals in different octaves, GE revisions, Omission of current key accidentals
notation: Pitch