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?? ??? ???????? ???-??? ???????? ??????? ???? ??? ???????? ????? ???? ??? ?????????? ?????? ???? ?????. ????????????? ?????: 1. ??? ???????????? ??????? ???????? ???? ??????? ????????? ??????? ???????? ????? ???? ??? ????????? ??????? ???????? ????. 2. ?????-??? ??? ???????? ??????? ????????? ???? ??? ??????? ????? ????????? ????? ????.

① ??????? ????????? ???? ??? ??? ???? ?????? ?????????
② ?????? ??? ??? ?????? ????????.
③ ?? x ?? ??? ??????? ????? ????? ??? ???????.
④ ?????????????? ??? ???????.
⑤ ????? ??? ??????.

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