In the early autographs the return of the first section of the Waltz is marked in an abbreviated manner as Dal Segno. Particular manuscripts place this sign (segno) in different places, depending on the version of transition from the middle section:
In As, in order to present all written down versions of accompaniment in bars 21-36, in the version "editors" we do not include this manner of notation of the reprise and we write bars 77-108 in extenso.
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category imprint: Differences between sources; Editorial revisions; Source & stylistic information
notation: Shorthand & other