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Source:
p. 9, b. 284-335
GC - Gutmann's copy
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Out of the three rhythmic variants in the RH part in this bar only two are definitely authentic : 
in GC (>GE1) and 
in FE. The rhythm in GC comes as the earlier version and while correcting FE Chopin replaced it with the rhythm consistent with bars 322, 326 and also 342. The EE variant may well be the earliest one of the bar, however we cannot rule out an error here. The editor of GE2 when introducing the FE version most probably unconsciously repeated Chopin's correction made earlier to FE.
See b. 330
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category imprint: Differences between sources
issues:
notation: Rhythm