FC
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The clear fleck at the pitch of b in the chord on the 2nd crotchet of the bar is probably simply an ink blot. This note is absent in all the remaining sources; it is also absent in all the sources in the remaining three analogous places (bars 19, 51 and 59).
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category imprint: Differences between sources; Source & stylistic information
issues: Errors of FC
notation: Pitch