Re: [DOCS] EXCEPT/INTERSECT

> Thomas, can you add stuff for INTERSECT and EXCEPT.  I assume you know
> what they do.  I am just adding the grammar to the docs as needed.

I went ahead and added them, and cleaned up Cartesian.  I did not know
what to do with the last UNION related to CORRESPONDING, so I just left
it, and did not add INTERSECT or EXCEPT sections to that area.

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