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Source:
p. 2, b. 11-21
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In A entire b. 16 and the 1st R.H. quaver in b. 17 were first written in an earlier version: 
. Chopin then crossed them out entirely and entered the final text, although not without hesitation (mistakes?) – in the later version the 6th R.H. quaver was initially written down in the original version (d
2-d3), while at the beginning of b. 17 there was most probably an f1-a1-d2-f2 chord.
See also the note in b. 17.
Compare the passage in the sources»
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Main-line changes
notation: Pitch
Missing markers on sources:
A, FC, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, EE1, EE2, GE3, EE1a