In bars 47-50 and 58-59 in the main text we keep the unquestionable A notation, in which the 2nd quaver in the bar is extended to a crotchet with an additional stem, pointing upwards. These stems having been led to the top quaver beam in the editions most probably resulted from a misunderstanding of the A notation. The augmentation dots to these quavers in bar 48 and 50 could be a consequence of Chopin's ad hoc proofreading, performed only in these 2 bars, aimed to extend the second quavers in these bars in a simplified manner (without removing fragments of stems), which is required by strict notation to hold them until the following minims.
See b. 45
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notation: Rhythm