???? & ?????? ???????? ???????? ???? ?? ??? ?? ???? ?? ???????? '(??, ?? ??) ??????'?? ???????? ???? ???????- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ?????If a grammatical principle that is definitely extra to ????is often a vowel ??and there is no other alternative besides a vowel ??then that grammatical theory can not be extra to ????