Manual: add set union and intersection operators in the macro-processor
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@ -10799,6 +10799,8 @@ The following operators can be used on arrays:
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* Comparison operators: ``==, !=``
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* Dereferencing: if ``v`` is an array, then ``v[2]`` is its 2nd element
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* Concatenation of two arrays: ``+``
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* Set union of two arrays: ``|``
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* Set intersection of two arrays: ``&``
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* Difference ``-``: returns the first operand from which the
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elements of the second operand have been removed.
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* Cartesian product of two arrays: ``*``
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