A
compare
In A there are visible traces of a change of the bottom note in the 3rd chord in bars 5-6 (as well as in bars 13-14, which are marked in an abbreviated form in A as a repetition of bars 5-6). Originally, all the places featured c2, hence Chopin proceeded from the strictly analogous version to bars 1-2. Cf. bars 37-38.
Compare the passage in the sources »
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A
notation: Pitch