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setunion function takes multiple sets and produces a single set
containing the elements from all of the given sets. In other words, it
computes the union of
> setunion(["a", "b"], ["b", "c"], ["d"]) [ "d", "b", "c", "a", ]
The given arguments are converted to sets, so the result is also a set and the ordering of the given elements is not preserved.
containstests whether a given list or set contains a given element value.
setintersectioncomputes the intersection of multiple sets.
setproductcomputes the Cartesian product of multiple sets.