return partitionImpl(iterator, size, true);
  }

  private static <T extends @Nullable Object> UnmodifiableIterator<List<@Nullable T>> partitionImpl(
      Iterator<T> iterator, int size, boolean pad) {
    checkNotNull(iterator);
    checkArgument(size > 0);
    return new UnmodifiableIterator<List<@Nullable T>>() {
      @Override
      public boolean hasNext() {
        return iterator.hasNext();
      }

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