Lack of the sign in EE may indicate distraction of the engraver, copyist (if it was a copy of A that was the base text to EE) or of Chopin himself, if it was another autograph that constituted the base text or if the dynamic signs were added by Chopin already after the copy had been prepared. Moreover, in EE there are no dynamic signs in bars 4-7.
Also in AI, the second four-bar section of the Etude is practically devoid of dynamic signs – the accent in bar 6 is the only indication of this type.
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category imprint: Differences between sources; Corrections & alterations
notation: Articulation, Accents, Hairpins