CLI
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b. 31
Neither in CLI nor in Ap there are cautionary naturals before the 2nd crotchet in the L.H. Chopin would add signs at different stages of the Etude's publication preparations – before B in the base text for FE, before F in a later proofreading.
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category imprint: Differences between sources
issues: Cautionary accidentals, Authentic corrections of FE
notation: Pitch