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Source:
p. 5, b. 82-103
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In the L.H. part there is only one 
in A, before the 1st crotchet. In GE (→FE,EE,IE) this patent inaccuracy was corrected by adding both necessary flats.
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category imprint: Interpretations within context; Differences between sources
issues: Errors of A
notation: Pitch
Missing markers on sources:
A, GE1, FE1, IE1, EE1, EE2