???? ????? ??????? ?? ?????? ?????? ???? ???? ??? ????? ?? ???? ??? ??????? ??????? . ???? ??? ??????? ??????? ???? ?????? ??? ??????. ????? ??????? ??????? ?????????. ????? ?????? ?????? ?????? ???????? ???????. ???? ??????? ??????? ????? ????? ?? ??????. Selecting ???? ????? ??????? ??? ????? ???? ?????? is important ????? ??? aspects