CDP
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b. 9
The missing both in AI and EE is only one of numerous proofs for a less accurate elaboration of the Etude in these sources.
In CDP there are no performance indications until bar 19, which is certainly a result of the copyist's inattention or his conscious decision, being a result of, e.g., hurry.
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category imprint: Differences between sources; Corrections & alterations
notation: Verbal indications