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Source:
p. 1, b. 1-22
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In A one can see that the 
to a
was being removed. Chopin entered it probably under the influence of the preceding bars, in which he had to write flats to the a1 notes.
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category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Last key signature sign
notation: Pitch
Missing markers on sources:
A, GE1, FE1, IE1, EE1, EE2