Lists as Sets (ANSI and GNU Common Lisp Document)

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#### 14.1.2.2 Lists as Sets

Lists are sometimes viewed as sets by considering their elements unordered and by assuming there is no duplication of elements.

      adjoin         nset-difference    set-difference    union
      intersection   nset-exclusive-or  set-exclusive-or
      nintersection  nunion             subsetp

           Figure 14–5: Some defined names related to sets.