???? & ?????? ???????? ???????? ???? ?? ??? ?? ???? ?? ?????????? ?? ?? ? ??? ???? ??? ????? ??? ???? ??? ??? ??? ? ????. ???? ?? ??? ??? ??? ? ???? ???? ????? ?????.If a grammatical basic principle which is included to ????can be a vowel ??and there is no other possibility aside from a vowel ??then that grammatical principl