AI
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AI is lacking in the 
lowering d
1 to d1. We regard it as the composer's oversight – after two multiple progressions, in which the 1st note of the bar is a fourth higher than the preceding one, Chopin could have considered d1 to be obvious here.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Omission of current key accidentals
notation: Pitch