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▽????=??? ????? ?????(10?·???) ▽??=?????(10?·??) ▽????=???? ???(??) ▽??=???? ?????? ??????? ??????? ?????? ??????? ????????? ?????????(10?·???) ???? ??????? ?????? ??????? ???????(14?·???) ▽??????????=????? ????? ???????? ?????? ????(10?·??)