code: public static IteratingRLW bufferedor(final int bufSize,
                                            final IteratingRLW... al) {
          if (al.length == 0)
              throw new IllegalArgumentException("Need at least one iterator");
          if (al.length == 1)
              return al[0];
  
          final LinkedList<IteratingRLW> basell = new LinkedList<IteratingRLW>();
          Collections.addAll(basell, al);
          return new BufferedIterator(new BufferedORIterator(basell, bufSize));
      }
docs: Aggregate the iterators using a bitmap buffer.
  
  @param al      iterators to aggregate
  @param bufSize size of the internal buffer used by the iterator in
  64-bit words
  @return or aggregate