added by Chopin in FED confirms that the absence of 
in the preceding bar in FE was an oversight of the engraver. According to us, both indications, although neither of the sources contains both at the same time, are not mutually exclusive; what is more, they could be considered complementary. Therefore, in the main text we include the addition of FED in a variant form.
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category imprint: Differences between sources
issues: Annotations in teaching copies, Annotations in FED
notation: Verbal indications