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??? 97??????????????? 3????? 8?? ???. ??? 4? ?? ???? ????????? ??? ?? D? ?? ??? ???? 2?? ???? ??? ??? ?? ????? 3?0(15―2, 15―2, 15―0)?? ????? ???? ????. ??? ??? ???? 3??? ??, ??????? 8?? ????. ?? ??? ?? ?? A?? ????, B?? ???, C?? ???, D?? ??? ???? ???? 8?? ????. 〈?????〉