A
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We consider the mark of A, which is quite unclear, as a long accent. The atypical notation probably stems from lack of space caused by the corrections performed one line above. This could also have been a reason for the mark's omission in the editions.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Long accents, Inaccuracies in FE
notation: Articulation, Accents, Hairpins