CK
compare
in 
The version of A1 must be earlier; taking into account the correction introduced in this autograph in analogous b. 5, one can assume that Chopin left it here by inadvertence. Anyway, [A2] must have included a here.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Omitted correction of an analogous place
notation: Pitch
