In the main text we add a cautionary 
before c
2. The mark was added also in GE2 (→GE3). In A one can see here a crossing-out, perhaps of a , which would be another dispensable accidental crossed out by Chopin (see b. 490-491). A sharp was added in FESf.
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category imprint: Differences between sources; Editorial revisions
issues: Annotations in teaching copies, GE revisions, Cautionary accidentals, Deletions in A, Annotations in FESf
notation: Pitch