}

    @LazyInit @CheckForNull private transient UnmodifiableNavigableMap<K, V> descendingMap;

    @Override
    public NavigableMap<K, V> descendingMap() {
      UnmodifiableNavigableMap<K, V> result = descendingMap;
      return (result == null)
          ? descendingMap = new UnmodifiableNavigableMap<>(delegate.descendingMap(), this)
          : result;
    }

    @Override

    }

    @LazyInit @CheckForNull private transient UnmodifiableNavigableMap<K, V> descendingMap;

    @Override
    public NavigableMap<K, V> descendingMap() {
      UnmodifiableNavigableMap<K, V> result = descendingMap;
      return (result == null)
          ? descendingMap = new UnmodifiableNavigableMap<>(delegate.descendingMap(), this)
          : result;
    }

    @Override