???? ??????? ???????? ????? ?? ????? ???? ???? ????? ????? ???? ???? ????? ????? ???? Components To understand Just before you buy ???? ???? ??????? ?? ????? ???? ???? ????? ??????? ?????? ????? ????? ??? ??????. ????? ?????? ????????? ???? ?????? ????????. ????? ???????? ??? ???? ????