???????? ???? ? ??? ?? ?? ???????? '(??, ?? ??) ??????'?? ???????? ???? ??????? ?????? ????????, ?? ??????, ?? ??, ?????? ?? ??????????????.If a grammatical theory that is additional to ????is usually a vowel ??and there is no other selection apart from a vowel ??then that grammatical principle can not be extra to ????????????? ?? ??? ??? ???