The natural before the initial third was misplaced in FE: before c1 instead of a. The mistake went to EE1, where the "superfluous" sign was omitted. Chopin added the necessary sign in FED; EE2 (→EE3) also includes the correct text.
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category imprint: Interpretations within context; Differences between sources
issues: Annotations in teaching copies, EE revisions, Errors in FE, Annotations in FED, Errors in EE
notation: Pitch