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We interpret the 
mark entered into A as a long accent – the mark concerns the R.H. top voice, which results from its position, and it naturally emphasises the syncopated c
2 crotchet. The A notation was precisely reproduced in the editions (except EE1, in which the mark was overlooked), which, in the case of printed text, suggests rather a diminuendo hairpin.
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category imprint: Graphic ambiguousness
issues: Long accents
notation: Articulation, Accents, Hairpins