return values().contains(o);
    }

    private static final long serialVersionUID = 0;
  }

  static final class SynchronizedAsMapValues<V extends @Nullable Object>
      extends SynchronizedCollection<Collection<V>> {
    SynchronizedAsMapValues(Collection<Collection<V>> delegate, @CheckForNull Object mutex) {
      super(delegate, mutex);
    }

    @Override

      return values().contains(o);
    }

    private static final long serialVersionUID = 0;
  }

  static final class SynchronizedAsMapValues<V extends @Nullable Object>
      extends SynchronizedCollection<Collection<V>> {
    SynchronizedAsMapValues(Collection<Collection<V>> delegate, @CheckForNull Object mutex) {
      super(delegate, mutex);
    }

    @Override