???? ????? ???????? ?? ?????? ?????? ???? ???? ??? ??????? ?? ???? ??? ????????. ????? ??? ??????? ??????? ???? ????? ??? ?????????. ????? ??????? ??????? ??????????. ????? ?????? ?????? ?????? ??????. ???? ??????? ??????? ??????? ????? ?? ???????. Selecting ???? ????? ??????? ??? looking for ???? ?????? need to consider ??? aspects. ,