??? ?????? ????????? ???? ?????????? ?????????? ??? ???? ????, ?????? ????????????????? ???????? ?????????? ?????? ???????????? ?????? ????? ???? ???? ???????? ???? ??????, ???? ???? ???? ?? ??? ??????.If a grammatical principle which is additional to ????is a vowel ??and there is no other alternative other than a vowel ??then that grammatical pri