?????? ???????? ?????????, ????????????? ??????? ????????.?? ??? ????????????? ???????? ??????. ?????- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ?????If a grammatical theory that is certainly added to ????can be a vowel ??and there is no other alternative in addition to a vowel ??then that grammatical theory can not be added to ????????????