?????? ??????????????????? ?? ??????? ???????? ??? ???????????? ???? ???? ????? ?????? ????????? ??- ???? ???? ?? ???? ?????? ???????? ?? ??? ?? ???????? ?? ????????(?? ?????????????? ??????????????)If a grammatical theory that may be added to ????is really a vowel ??and there's no other possibility apart from a vowel ??then that grammatical theory