A
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The fragment of the figuration from the 2nd to the 13th semiquaver is actually a repetition (an octave higher) of a respective fragment of the preceding bar (from the 6th semiquaver). The only difference is the 1st semiquaver in the 3rd group of that bar, f3, in relation to f
2 in b. 22. Many editors of subsequent collective editions considered it to be Chopin's mistake and changed f3 to f3. According to us, there are not enough reasons for such a change:
- in a similar figuration in b. 4-5 the sequence of intervals in b. 4 is completely different than in b. 5, which shows that Chopin did not strive for a strict repetition of the intervals used an octave lower;
- the initial version of b. 22 contained more differences, since the 5th, 7th, 8th and 10th semiquavers were written half a tone lower;
- Chopin's possible oversight would concern two accidentals – the
before f3 at the beginning of the 3rd group of semiquavers and the 
restoring f3 at the end, which reduces the chances of mistake.
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category imprint: Source & stylistic information
notation: Pitch