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