?????? ??????????????????? ?? ??????? ???????? ??? ???????????? ???? ???? ????? ?????? ????????? ?????? ?~??- ?? ???? - ???? ???? - ?? - ?????- ???? - ???? - ?? ?????- ????If a grammatical basic principle that may be included to ????can be a vowel ??and there is no other choice other than a vowel ??then that grammatical theory can not be added to ?