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Source:
p. 16, b. 399-424
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Prezentacja
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In the main text we add cautionary flats before b
2 at the beginning of bars 414, 415, 422 and 423. In the first two bars, the signs are present in EE3. Chopin wrote a respective 
in A in the last appearance of a similar situation, in bar 463.
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category imprint: Editorial revisions
issues:
notation: Pitch
Missing markers on sources:
A, Morch, GE1, GE1a, GE2, FE1, FE2, FED, FEJ, FES, EE1, EE2, EE3