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In JC, the third note counted from the bottom of the chord has a 
on the level of c2, while its head is on the level of d2. This patent error could have been provoked by Chopin's way of writing the interval of second: due to their small size, note heads were put one over another, as in the case of bigger intervals. Similarly in bar 50, which is not written out in JC.
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category imprint: Interpretations within context
issues: Errors of JC
notation: Pitch