In the main text, we add a cautionary 
before e3. The mark was added both in GE and EE; it was also written in FEH (the mark's shape is not typical of Chopin's handwriting).
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category imprint: Differences between sources
issues: Annotations in teaching copies, EE revisions, GE revisions, Cautionary accidentals, Annotations in FEH
notation: Pitch