Eight motorists drove to church one morning. Their respective houses and churches, together with the only roads available (the dotted lines), are shown. One went from his house $A$ to his church $A,$ another from his house $B$ to his church $B,$ another from $C$ to $C,$ and so on, but it was afterwards found that no driver ever crossed the track of another car. Take your pencil and try to trace out their various routes.
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