Issues : Omissions to cancel alteration
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b. 12-13
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composition: Op. 28 No. 16, Prelude in B♭ minor
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In A (→FC,FE) there is no accidental before the 4th semiquaver in the 3rd group, which would result in f category imprint: Interpretations within context; Differences between sources issues: EE revisions , Omissions to cancel alteration , GE revisions , Errors of A , Errors repeated in FE |
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b. 26-27
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composition: Op. 28 No. 16, Prelude in B♭ minor
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In A (→FE1,FC→GE1) there are no flats restoring e category imprint: Interpretations within context; Differences between sources issues: EE revisions , Omissions to cancel alteration , GE revisions , Errors of A , FE revisions , Errors repeated in GE , Errors repeated in FE |
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b. 29
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composition: Op. 28 No. 16, Prelude in B♭ minor
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In A (→FC,FE) there is no accidental before the 2nd semiquaver in the last group. The patent mistake, probably caused by the corrections to the figuration in the 2nd half of the bar, was rectified in GE and EE. category imprint: Interpretations within context; Differences between sources issues: EE revisions , Omissions to cancel alteration , Errors resulting from corrections , GE revisions , Errors of A , Errors repeated in FE |
2, which is impossible in this context. The oversight of a cancelled alteration, frequently encountered in Chopin's music, was corrected in 
2 in these bars, which is Chopin's patent inadvertence. The accidentals were added in