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Just like in b. 223 and 227, the version of EE1 in b. 243 and 247 is probably Chopin's mistake adopted from a proof copy of FE. The natural raising a1 to a1 was added in both bars in the penultimate stage of proofreading of FE (→GE). The correction was also introduced in EE2.
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions, Omission of current key accidentals, Authentic corrections of FE, Last key signature sign
notation: Pitch