3. The method of claim 1 comprising placing the word established at an arc of the WFST with an output label into a word lattice as the tokens are being propagated.
3. The method of claim 1 comprising placing the word established at an arc of the WFST with an output label into a word lattice as the tokens are being propagated. 4. The method of claim 3 comprising performing an exception update of the word lattice by recombining multiple tokens into a single new active token when the word history designations of the multiple tokens are different, and comprising: placing word lattice node references of the multiple tokens into the new active token when the references are unique to other references from other ones of the multiple tokens, and maintaining the reference with the best score for the new active token when the reference is the same among more than one of the multiple tokens.