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p. 1, b. 1-11
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b.
In A (→FC,FE) there are no accidentals before the 13th and the 15th semiquavers. As the previous accidentals (in this case the 
before a2) were then often considered to alter also the notes at the same pitch under an octave sign, it was necessary to determine whether the 4th group of semiquavers contains a3 or a
3. The melodic and harmonic context as well as a comparison with similar b. 23 indicate that it should be a3 (twice), hence we add a 
before the 13th semiquaver, as it was performed in EE. The version of GE, acceptable in terms of sound, is almost certainly inauthentic, since it is difficult to assume that Chopin would not have marked the return of a3 two notes apart.
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issues:
Missing markers on sources:
A, FC, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, GE3, EE1, EE2, EE1a