logically, when dealing with boolean operations, the operations are :
UNION
Returns the result of combining the primary and secondary Sets.
COMBINE
Returns Similar to the Union operation but removes the Members in common.
SUBTRACT
Returns a set of Members with common Members removed from the Primary Set
INTERSECT
Returns a set of everything <edit> common to the Sets
Using these terms should not cause a problem.
editted:
I got NOTted.