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rectangle, ellipse, or circle. In traditional computer programming, this would result in long IF-THEN statements testing what sort of object the shape was and calling the appropriate code. The object-oriented way to handle this is to define a class called Shape with subclasses such as Rectangle and Ellipse (which, in turn, have subclasses Square and Circle) and then to simply send a message to any Shape asking it to compute its area. Each Shape object will

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