Return a newly constructed list of the unique elements in iterable l.
abjad> l = [1, 1, 1, 2, 3, 3, 4, 5] abjad> listtools.unique(l) [1, 2, 3, 4, 5]
Defined equal to list(set(l)).
listtools.truncate_to_weight
listtools.weight
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