Issues : Errors repeated in FE

b. 8-12

composition: Op. 28 No. 20, Prelude in C minor

d1 in A (literal reading→FC,FE) & CGS

d1 in AB, ACh, GE, EE & FES

..

The missing  restoring d1 is almost certainly an oversight of Chopin in A (→FC,FE), which is proven by the naturals in AB, ACh and the one added in b. 8 in FES. The accidentals were also added by the revisers of GE and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , GE revisions , Errors of A , Errors repeated in FE