In the figure below, \(AB \parallel PQ\) and \(AB \parallel RS\). \(CDE\) is a straight line that intersects \(PQ\), \(AB\), and \(RS\) at \(C\), \(D\), and \(E\), respectively. Using this figure, show that \(PQ \parallel RS\), i.e., if two lines are parallel to a third line, then they are parallel to each other.

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