????? ????????? ???????? ???? ????? ??? ????? ???? ???????? ????? ?? ?????? ??? ???? ????? ??? ??????? ?? ??????. ????? ????? ??? ?????? flexibility ???????. ??? ??????? ???? ???? ??? ?????? ????: ??????? ??????? : ??? ?????: ????? ?????? ?? ???? ?? ???? ?? ????? ?????? ?????? ??????? ?? ??????? ???? ?? ?????? ????? ?????? ???????