In FE we can see here "zf", which we change to the correct 
. We discuss in detail the issue of the Chopinesque notation of forzato and its variants in other sources in the note in bar 1. In GE and EE the abbreviation was arbitrarily revised: zf was replaced by rf.
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category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Inaccuracies in FE, GE revisions
notation: Verbal indications