In PE1 (→PE2) there is no 
lowering f
2 to f2. The patent mistake was corrected in GE. A natural to this note was also added in PE3 (→PE4); however, it was placed on the wrong side of the note – right.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Errors resulting from corrections, GE revisions, Sign reversal, Errors in PE, Revisions in #PE
notation: Pitch