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Set Operators            Operators for Sets

                              Set Operators
        ---------------------------------------------------------------
        Operator     Meaning               Operands             Result
        ---------------------------------------------------------------
          *          set intersection      sets                 set
          +          set union             sets                 set
          -          set difference        sets                 set
          in         P is in Q             Ordinal type, set    Boolean
          =          equal                 sets                 Boolean
          <>         not equal             sets                 Boolean
          <=         P is a subset of Q    sets                 Boolean
          >=         Q is a subset of P    sets                 Boolean
        ---------------------------------------------------------------

See Also: in
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