?????? ?? ?? ?? ???? ???????????? ??????????If a grammatical principle that's included to ????is often a vowel ??and there is no other option in addition to a vowel ??then that grammatical theory can't be included to ????- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ??????????????? ??????(??)???? ???????? ???? ??????, ???? ???, ???? ?? ?? ??