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Source:
p. 1, b. 1-29
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In the main text we give a 
raising f1 to f
1 after A (→FC→GE). The accidental is absent in FE, which can almost certainly be attributed to the distraction of the engraver of FE, who forgot to insert a in the place between the notes left especially for this purpose. Chopin added a in FED; it was also added in EE.
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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
notation: Pitch
Missing markers on sources:
A, FC, EE1, EE2, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, GE3, EE1a