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Source:
p. 1, b. 1-24
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The 
time signature in FE (→EE1) is almost certainly a result of inattention or manner of the engravers of FE, who in numerous pieces by Chopin seemed not to differentiate between and 
– see the Etudes, Op. 10 or the Impromptu in A
major, Op. 29. Therefore, in the main text we give , written in GC (→GE), whose correctness and authenticity do not raise any doubts. This time signature – probably under the influence of GE – was introduced also in EE2.
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions, Errors in FE, 4/4 or 2/2
notation: Rhythm
Missing markers on sources:
FESch, FED, FES