}
    ImmutableSetMultimap<V, K> invertedMultimap = builder.build();
    invertedMultimap.inverse = this;
    return invertedMultimap;
  }

  /**
   * Guaranteed to throw an exception and leave the multimap unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override