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It is highly likely that Chopin added 
at the time of proofreading FE (or introducing last corrections to the base text, probably [A]). All changes, certainly or highly likely introduced into FE at the transition between bars 30-31 – rhythmic notation of the last quaver in bar 30, omission of the tie of b
1 and pedalling and in bar 31 – may be considered as related.
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category imprint: Differences between sources
issues: Authentic corrections of FE
notation: Verbal indications