7. The encoding data processing apparatus as claimed in claim 3 , wherein, the values of the first of the at least two fields are uniquely associated with seeds for generating the first set, and the values of the first of the at least two fields in combination with the values of the second of the at least two fields are uniquely associated wit seeds for generating the second set.
8. The encoding data processing apparatus as claimed in claim 7 , wherein, the code words are generated from pseudo-random numbers, and the data words are formed from digits.