???? ????? ???????? ?? ?????? ?????? ???? ???? ??? ??????? ?? ???? ????? ??????. ???? ??? ??????? ??????? ???? ?????? ??? ?????????. ????? ??????? ??????? ?????????. ????? ?????? ?????? ?????? ?? ???????? ???????. ???? ??????? ??????? ??????? ???? ?? ??????. ?????? ???? ????? ??????? ??? ????? ???? ?????? need to consider ??? ?????. ??