???? ????? ??????? ?? ?????? ?????? ???? ???? ??? ??????? ?? ???? ??? ????????. ???? ??? ??????? ??????? ???? ????? ??? ?????????. ????? ??????? ??????? ??????????. ????? ?????? ?????? ?????? ?? ??????. ???? ??????? ??????? ??????? ???? ?? ??????. Selecting ???? ????? ??????? ??? looking for ???? ?????? is important evaluate ??? factor