docs: public static <E extends Enum<E>> EnumMultiset<E> create(Iterable<E> elements) {
      Iterator<E> iterator = elements.iterator();
      checkArgument(iterator.hasNext(), "EnumMultiset constructor passed empty Iterable");
      EnumMultiset<E> multiset = new EnumMultiset<E>(iterator.next().getDeclaringClass());
      Iterables.addAll(multiset, elements);
      return multiset;
    }