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