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According to us, the authenticity of 
does not raise any doubts. In turn, 
in FC (→GE) may be a result of an inaccurate interpretation of [A] by the copyist – the 'f' and 'z' letters from some of Chopin merge in such a way that they can be considered as one 'f' letter, i.e. (see the Etude in E
major, Op. 10 No. 11, bar 25 or 50).
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category imprint: Differences between sources
issues: fz – f
notation: Verbal indications