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?? ??????? ?????????????, ??-????? ??????????? ?? ??????????????? ?????? ??? ??????? ??????????? ??????????? ?? ???, ??????: ?????? ????? ???? ???????? ????? A ?? B ?????? ?????????? ???? ????? ?????? ??????. ?? ??-????? ?????????? ?????? ??? ???? ?? , ?????, ???? ??? ????????? ????????? ?????? ?????? ???? ????????, ?????? ?????????? ??????? ?????? ??????? ???????? ????????? ?????? ???????? ????? ????.

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U-shaped ?????????? ?????? ????? ??????? ??? ????????? ?????? ?????????, ??????????? ??? ??? ??????? ?????? ??????? ???? ?????. ???? ???? ????????: ??????? ????? ??????????????? ???? ????? ???? ????? ???? U-????????? ???????????? ?????? ??? ????. ?????? ?????, U-shaped ?????????? ?????? ???? ???????????? ?????? ?????? ????. ???? ?????, ???????????? ?????????? ??? ????? ?????????? ????????? ??????? ?????????? ??? ???????? ???????? ???? ?????????? ??? ?????? ????????? ????? ??? ????.

U-shaped ???? ????????? ??????? ???????????? ?? ???? ???????? ??? ?? ??? ????? ???????? ???? ??????? ?????????? ???????? ??????? ??? ?????? ?????? ???????? ????. ????? ????? ??? ??? ??????????? ???????? ????????, U-shaped ?????????? ????????? ???? ????.

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