GC
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The naturals raising g
2 to g2 and g1 to g1 are certainly an arbitrary addition of the reviser of EE2, who perhaps considered the natural character of the piano grip, since in terms of style, there is no reason to assume here an oversight of the naturals by Chopin.
In the main text we add a cautionary 
before g2 in bar 151.
Compare the passage in the sources »
category imprint: Differences between sources
issues: EE revisions
notation: Pitch