exists — Checks if a transform applied to each member of a set returns an empty set
exists ( transform )To determine if an object
passes the test it is first
converted to a set
containing only that object;
the transform is applied to that set;
the filter passes if the result of the transform has at least one member.
If transform is not stateless
keep in mind that it will be applied as if each element filtered
comprises its own separate set.
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