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Returns the universe of the Set.
$universe
The universe is a Set that specifies where the given Set lives, by default this is the UniversalSet. This is useful for taking the absolute complement of a Set.
Other set accessors: class(), elements, length(), lower, max(), min(), properties, range(), traits, type, upper
class()
elements
length()
lower
max()
min()
properties
range()
traits
type
upper