?? ??????)??????? ?????? ?? ????, ??, ?? ?? ????.???????????? ??? ???? ???????? ??????? ??. ?????? ????????, ?? ??????, ?? ??, ?????? ?? ??????????????.If a grammatical principle that is definitely extra to ????is usually a vowel ??and there is no other solution apart from a vowel ??then that grammatical theory can't be added to ?????????? ?????? ?