???? ???????? ????????? ???? ???? ?? ????? ?? ?? ? ??? ???? ??? ????? ??? ???? ??? ??? ??? ? ????. ???? ?? ??? ??? ??? ? ???? ???? ????? ?????.If a grammatical basic principle that is additional to ????can be a vowel ??and there's no other possibility apart from a vowel ??then that grammatical basic principle can't be added