The version of FE (→EE1) with c
2 in the ending of the trill is most probably erroneous. It is indicated by visible traces of removal of a 
before this note in FE and GE – c2 does not require any sign in this case, hence the was most probably printed by mistake, instead of 
, natural in this context. In this situation, removal of this sign in FE may be considered a result of either ordering of the notation of accidentals by the reviser or of Chopin's incompletely implemented proofreading, aiming at restoring . Therefore, in the main text we give the version of GE, in which the was replaced with a , perhaps by the composer himself. A double sharp was added also in EE2 (→EE3).
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Errors in FE, Errors in EE
notation: Pitch