symmetric difference

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The symmetric difference operator is applicable to Set variables. By mathematical definition, A >< B is (A-B) joined with (B-A).

procedure test_differ;
var
  a: set of char = ['a', 'b', 'c'];
  b: set of char = ['b', 'c', 'x', 'y'];
  c: set of char;
begin
  c:= a >< b; // c becomes ['a', 'x', 'y']
end;