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Source:
p. 4, b. 50-84
GE3 - Revised impression of GE2
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b. 70-72
The change of piano to in EE had practically no impact on the sense of that indication; meanwhile, moving it in between the staves in GE2 (→GE3) may suggest that it applies to the L.H. as well, which is definitely not what Chopin intended.
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category imprint: Differences between sources
issues: EE revisions, GE revisions
notation: Verbal indications