?? ???? ???????? ?????? ????????? ?? ??????.If a grammatical theory that is definitely added to ????can be a vowel ??and there's no other selection other than a vowel ??then that grammatical basic principle can not be extra to ????- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ?????- ???? ?????????? ???? ???????? ?????????? ??????????? ???????