Fix for docs from Patrick Welche:
! DIFFERENCE (− or ∖): builds the set difference of two tables. Let <classname>R</classname> and <classname>S</classname> again be two tables with the same arity. <classname>R</classname> - <classname>S</classname> --- 488,494 ---- <listitem> <para> ! EXCEPT (− or ∖): builds the set difference of
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