?? ???? ???????? ?????? ????????? ?? ??????.??????? ???? ??? ???????????? ???????? ??????????. ??????? ???? ??????????.- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ?????If a grammatical principle that may be added to ????is a vowel ??and there is no other alternative besides a vowel ??then that grammatical basic principle can't be added to ?