8. A system according to claim 1 , further comprising a word adder configured to add a new word to the second set of words.
8. A system according to claim 1 , further comprising a word adder configured to add a new word to the second set of words. 9. A system according to claim 8 , wherein the word adder includes a membership assigner configured to assign memberships in said first set of categories for said new word.