Measures 21 - 34

In measure 21, Chopin starts an ascending progression that goes to B minor, C# minor and finally G minor. In measure 22, the V7 of G minor is used as a German augmented sixth chord of F# minor to prepare a coda in this key:

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Notice the use of the Neapolitan sixth chords in measures 24 and 33:

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Measures 27 and 28 are repeated in F# major before a final cadence that uses another Neapolitan sixth chord:

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