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  SET OF <ordinal type>
 
  Description
 
    The keyword SET defines a group that contains zero or more related
    elements of some ordinal type. The elements must have a range of
    256 or less. The following are the only legal operations on sets:
 
      Assignment
      :=    defines a value of a set
 
      Logical combination
      -     returns the difference between two sets
      *     returns the intersection between two sets
      +     returns the union of two sets
 
      Inclusion
      <=    tests if a set is a subset of a set
      >=    tests if a set contains a subset of a set
      IN    tests if something is a member of a set
 
      Relational
      =     tests for set equality
      <>    tests for set inequality
 
  See also:  Data Types Hierarchy