In these bars, AI does not contain a single L.H. motivic/articulation slur, which results from the working nature of this autograph – cf. b. 64-65.
In AF the slurs in b. 70-71 and 73-75 (as well as 65) illustrate how inaccurately written Chopin's slurs could be – their range does not raise any doubts here only thanks to the rests surrounding the motifs encompassed by the slurs.
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category imprint: Differences between sources; Corrections & alterations
issues: Embracing slurs
notation: Slurs