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We put the dim. indication, present only in AI, at the transition between bars 74-75. According to us, one cannot exclude that Chopin had in mind the transition of bars 73-74. The indication – in spite of its arrangement – does not seem to be necessary at all in the final version, after the previous dim. and 
(in AI none of these indications are present).
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category imprint: Differences between sources; Corrections & alterations
notation: Verbal indications