}

  /** The implementation of {@link Maps#unmodifiableEntrySet(Set)}. */
  static class UnmodifiableEntrySet<K extends @Nullable Object, V extends @Nullable Object>
      extends UnmodifiableEntries<K, V> implements Set<Entry<K, V>> {
    UnmodifiableEntrySet(Set<Entry<K, V>> entries) {
      super(entries);
    }

    // See java.util.Collections.UnmodifiableEntrySet for details on attacks.

    @Override

  }

  /** The implementation of {@link Maps#unmodifiableEntrySet(Set)}. */
  static class UnmodifiableEntrySet<K extends @Nullable Object, V extends @Nullable Object>
      extends UnmodifiableEntries<K, V> implements Set<Entry<K, V>> {
    UnmodifiableEntrySet(Set<Entry<K, V>> entries) {
      super(entries);
    }

    // See java.util.Collections.UnmodifiableEntrySet for details on attacks.

    @Override

       */
      return Collections.unmodifiableSet(delegate().get(key));
    }

    @Override
    public Set<Map.Entry<K, V>> entries() {
      return Maps.unmodifiableEntrySet(delegate().entries());
    }

    @Override
    public Set<V> removeAll(@CheckForNull Object key) {
      throw new UnsupportedOperationException();
    }

    @Override