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## `CarShape` and `HouseShape` Classes

    public class CarShape implements SceneShape
    {
       ...
       public void setSelected(boolean b) { selected = b; }
       public boolean isSelected() { return selected; }
       private boolean selected;
    }

    public class HouseShape implements SceneShape
    {
       ...
       public void setSelected(boolean b) { selected = b; }
       public boolean isSelected() { return selected; }
       private boolean selected;
    }

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