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Source:
p. 21, b. 471-486
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The missing 
mark may have resulted from Chopin's inadvertence; however, it is also possible that the composer left the task of finding the right moment to release pedal to the discretion of the performer. According to us, pedal is to be held at least until the beginning of bar 479 and rather not longer than until the beginning of bar 480, which is suggested by two marks [], proposed in the main text.
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category imprint: Editorial revisions
issues: No pedal release mark
notation: Pedalling
Missing markers on sources:
GE1, GE2, FE1, FED, FEH, FEJ, FES, GE3, EE1, EE2, EE3, Atut, GE2a, FEFo