code: @SuppressWarnings("unchecked") //
    public static <E> ImmutableMultiset<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E... others) {
      return new Builder<E>().add(e1).add(e2).add(e3).add(e4).add(e5).add(e6).add(others).build();
    }
docs: Returns an immutable multiset containing the given elements, in the "grouped iteration order"
  described in the class documentation.
  
  @throws NullPointerException if any element is null
  @since 6.0 (source-compatible since 2.0)