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???????? ????? ???????? (HEC) ?? ???? ????? ?????? ????? ????? ?????????? ?? ????? ?????????? ?? ???? ?? ?????? ??????? ???????? ???????. ????? ???? ??????? ????? ?????? ??????? ???????? ?? ???????? ????? ???????? ???? ?????? ???????? ?????? ?????? ?????????? ???? ??????? ???? ?????? ?????????. ???? ??? ???????? ?????? ??????? ?? ????? ????? ????? ?????? ?? ?????? ??? ???? ????? ????????. ????? ??? ????? ??????? ?????? ?????? ??????? ????? ?????? ?????? ???????? ??????? ???????? ??? ?????????? ????????? ???????. ?? ???? ??????? ????? HEC ?? ?????? ?????? ????? ??????? ???????. ???? ???? ??????? ????? ?????? ??????? ???????? ????? ???????? ????? ???????? ????? ????? ?????? ???? ?????? ??? ????? ???? ??????? ?? ???????? ????? ?????? ?? ???? ????? ??????????. ???????? HEC? ???? ?? ?????? ???? ???? ?????? ??????? ?????? ????????? ??? ???? ?????.