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The UNION of two sets is the set of elements which are in either set.

For example: let C = (4, 5, 6) and let D = (6, 7, 8). Now the UNION of C and D, written C D = (4, 5, 6, 7, 8). There is no need to list the 6 twice.

The INTERSECTION of two sets is the set of elements which are in both sets.

For example: let C = (4, 5, 6) and D = (6, 7, 8). The INTERSECTION of C and D, written C D = (6).

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