static <E extends Comparable> TreeMultiset<E> | 
TreeMultiset.create() | 
 Creates a new, empty multiset, sorted according to the elements' natural order. 
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static <E extends @Nullable Object> TreeMultiset<E> | 
TreeMultiset.create(@Nullable Comparator<? super E> comparator) | 
 Creates a new, empty multiset, sorted according to the specified comparator. 
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static <E extends Comparable> TreeMultiset<E> | 
TreeMultiset.create(Iterable<? extends E> elements) | 
 Creates an empty multiset containing the given initial elements, sorted according to the
 elements' natural order. 
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