?? ?????? ??? ???????????? ?????? ??????? ???????? ?????????? ??? ????.?? ??? ????????????? ???????? ??????. ?????If a grammatical principle that's additional to ????can be a vowel ??and there's no other solution besides a vowel ??then that grammatical basic principle cannot be added to ??????(??)?? ?????? : ??, ??, ????, ??, ???? ?·???????, ??