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The missing slur over the L.H. top voice seems to be an oversight if we take into account the respective slurs in bars 81-83 and 85-86. Moreover, it cannot be excluded that the engraver (or Chopin in [A]) omitted the slur, as there was no place for it. Therefore, in the main text we suggest adding a slur to fill the gap.
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category imprint: Editorial revisions
notation: Slurs