in 
In AI Chopin did not put any marks in those places, and the imprecise notation of A may be blamed for difficulties with interpreting those marks, resulting in discrepancies in the first editions that have short accents, long accents and diminuendo hairpins in various configurations in bars 25, 27 and 31.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Interpretations within context; Differences between sources; Corrections & alterations
issues: Long accents, Inaccuracies in GE, GE revisions
notation: Articulation, Accents, Hairpins