???? ????? ??????? ?? ?????? ?????? ???? ???? ??? ??????? ?? ???? ????? ??????? ??????? . ???? ??? ??????? ??????? ???? ????? ??? ??????. ????? ??????? ??????? ?????????. ????? ????? ?????? ?????? ?? ???????. ???? ??????? ??????? ????? ???? ?? ???????? . ?????? ???? ????? ??????? ??? looking for ???? ?????? need to consider ??? facto