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On the 4th quaver of the bar, JC has the a1 note, similarly as on the second. It is almost certainly a mistake, perhaps of Chopin himself committed in [AI]. Such a type of errors belongs to the most often both in autographs and copies.
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category imprint: Differences between sources
issues: Terzverschreibung error, Errors in the number of ledger lines, Errors of JC
notation: Pitch