code: public static <E> ConcurrentHashMultiset<E> create(Iterable<? extends E> elements) {
      ConcurrentHashMultiset<E> multiset = ConcurrentHashMultiset.create();
      Iterables.addAll(multiset, elements);
      return multiset;
    }
docs: Creates a new {@code ConcurrentHashMultiset} containing the specified elements, using the
  default initial capacity, load factor, and concurrency settings.
  
  <p>This implementation is highly efficient when {@code elements} is itself a {@link Multiset}.
  
  @param elements the elements that the multiset should contain