EE2
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2-a3 in 
The undoubtedly earlier version of AI constitutes the ending of the deleted four-bar section, which was originally written between bars 53 and 54:
It cannot be excluded that after having deleted this four-bar section, Chopin forgot to change the beginning of bar 54 in the part of the R.H.
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category imprint: Differences between sources; Corrections & alterations
issues: Changed phrase length
notation: Pitch