code: public String makeLastName(int number) {
  		if (number < 0 && number > TpccConstants.NUM_DISTINCT_CLAST - 1)
  			throw new IllegalArgumentException();
  		int indicies[] = { number / 100, (number / 10) % 10, number % 10 };
  		StringBuffer sb = new StringBuffer();
  		for (int i = 0; i < indicies.length; ++i) {
  			sb.append(TOKENS[indicies[i]]);
  		}
  		return sb.toString();
  	}
docs: Return a last name as defined by TPC-C 4.3.2.3.