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Similarly as two bars before, Ap features chords with the span of an octave on the 2nd beat of these bars. In the main text we give the chords with the span of a seventh present in the remaining sources.
In bar 23 there is no cautionary 
before b.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Chopin's hesitations, Cautionary accidentals, Accompaniment changes
notation: Pitch