??? ?????? ????????? ???? ?????????? ???????????????? ??? ???? ???????? ??????? ??.????? ???? ?? '??????' ?????????? ?? ???????? ???? ?? ?????? ???????? ?? = ????&??????®If a grammatical principle that's included to ????is a vowel ??and there's no other alternative in addition to a vowel ??then that grammatical principle can't be included to ?????