subset
A subset is a set which every element in the set is contained in a larger or equal size set. In other words a set with in a set.
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union
Union is the combination of the elements of two sets, without any duplicates.
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Demonstration of the indicated keyword.
A={1,3,5,7,9,} B={1,2,4,6,8} A U B={1,2,3,4,5,6,7,8,9}