... inability to ac-
count for the behavior of partially irregular verbs
(whose stems have a smaller number of allo-
morphs than the completely irregular) during their
conjugation.
There have been, ... machine translation, Moisil
(1960) proposed 5 regrouped classes of verbs,
with numerous subgroups, and introduced the
method of letters with variable values, while Pa-
pastergiou et al. (...