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1. ?????? ????? ???? ???? ?????? ( 180�).
2. ????? ??????? ?????? ?? ???????? ??? ?????.� ( ?????? ????,� ??? ??????).
3. ??????? ????? ?? ?????? ???????? ???? ?? ??????? ?????? ?????.
4. ????? ??, ?????? ??????? ??????? ?? ??? ????? ?????? (???? ???? ?? ?????? ????? ?????).
5. ????? ?? ??????? ???? 15 - 20 ????, ?? ????? ???? ????.
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