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Operators
+ (Set Union)
FUNCTION: Set Union operator
OPERAND TYPE: Union
RESULT TYPE: Compatible set types
REMARKS: The result of these operations must conform to the
rules of set logic:
An ordinal value c is in a + b only if c is in a or b.
An ordinal value c is in a - b only if c is in a and not in b.
An ordinal value c is in a * b only if c is in both a and b.
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Written by Dave Pearson