static final class SerializedForm implements Serializable {
    final Object[] elements;
    final int[] counts;

    // "extends Object" works around https://github.com/typetools/checker-framework/issues/3013
    SerializedForm(Multiset<? extends Object> multiset) {
      int distinct = multiset.entrySet().size();
      elements = new Object[distinct];
      counts = new int[distinct];
      int i = 0;

        Object[] keys = new Object[map.size()];
        Object[] values = new Object[map.size()];
        int i = 0;
        // "extends Object" works around https://github.com/typetools/checker-framework/issues/3013
        for (Entry<? extends Object, ? extends Object> entry : map.entrySet()) {
          keys[i] = entry.getKey();
          values[i] = entry.getValue();
          i++;
        }
        this.keys = keys;

   * @param otherElements the rest of the elements the set should contain
   * @return an immutable set containing those elements, minus duplicates
   */
  // http://code.google.com/p/google-web-toolkit/issues/detail?id=3028
  @GwtCompatible(serializable = true)
  public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(
      E anElement, E... otherElements) {