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In AI, in each of these bars, Chopin wrote a 
(cautionary?) to a
. The fact that this unnecessary accidental was repeated a few times suggests that the composer was uncertain about the presence of the raising a in the key signature of the B major/G minor keys. Cf. the Etude in G minor, Op. 25 No. 6, bars 7-8.
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category imprint: Source & stylistic information
issues: Cautionary accidentals, Last key signature sign
notation: Pitch