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Mathematics 9 Online
OpenStudy (anonymous):

Alice and Becky live on Parkway East, at the intersections of Owens Bridge and Bay Bridge, respectively. Carl and David live on Parkway West, at the intersections of Bay Bridge and Owens Bridge, respectively. Parkway East is a one-way street running east. Parkway West is one way running west. Both bridges are two way. Below represents the directed graph indicating road travel between the houses.

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