??(??)?? ????????????, ???????????? ???? '?? ????'???? ??, ?? ?????????? ???????????????? ?????? ???? ????????.   '(??, ?? ??) ??????'?? ???????? ???? ???????If a grammatical theory that is definitely included to ????is often a vowel ??and there is no other choice aside from a vowel ??then that grammatical theory cannot be extra to ????