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b. 1-3
Three digits defining the fingering of the first passages of the Etude (based on one finger arrangement) were added by Chopin in a proofreading of FE (→GE,EE). In EE, Fontana added to them a number of next ones, developing the composer's hints, specifying, e.g., the places of crossing under of the 1st finger.
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See b. 4-8
category imprint: Differences between sources
issues: EE revisions, Authentic corrections of FE
notation: Fingering