return (Collection<V>[]) new Collection<?>[length];
    }
  }

  static class EntriesGenerator<K, V, M extends Multimap<K, V>>
      implements TestCollectionGenerator<Entry<K, V>>, DerivedGenerator {
    private final OneSizeTestContainerGenerator<M, Entry<K, V>> multimapGenerator;

    public EntriesGenerator(OneSizeTestContainerGenerator<M, Entry<K, V>> multimapGenerator) {
      this.multimapGenerator = multimapGenerator;