???????? ?????? ?????????? ?????????? ?????????? ?? ?? ? ??? ???? ??? ????? ??? ???? ??? ??? ??? ? ????. ???? ?? ??? ??? ??? ? ???? ???? ????? ?????.If a grammatical principle that may be added to ????can be a vowel ??and there is no other solution other than a vowel ??then that grammatical theory can not be extra to ???????