GE1
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in 
The absence of the mark in GE probably results from the fact that Chopin entered it into FE (→EE) later, while proofreading, after the copy that served as the basis for GE had been sent. It is proven by a different font of the letter than in the remaining places in the piece.
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category imprint: Differences between sources
issues: Authentic corrections of FE
notation: Verbal indications