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