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Source:
p. 13, b. 244-260
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In FE, there are visible traces of removal of superfluous cautionary 
next to all b
1 in bars 256 and 257. The signs were probably removed in the first proofreading of FE, since they are absent both in GE and EE (cf. bars 254-255).
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category imprint: Source & stylistic information
issues: Cautionary accidentals, Authentic corrections of FE, FE revisions
notation: Pitch
Missing markers on sources:
FE1, FEO, FES, FESf, GE1, EE1, EE2, EE3