code: public long numBits() {
  		if (n == 0) return 0;
  		return offsets.size64() * log2BucketSize + lcpLengths.numBits() + lcp2Bucket.numBits() + mph.numBits() + transform.numBits();
  	}
docs: Returns the number of bits used by this structure.
  
  @return the number of bits used by this structure.