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Slide 21 text
open class UIView : UIResponder, NSCoding, UIAppearance, UIAppearanceContainer,
UIDynamicItem, UITraitEnvironment, UICoordinateSpace, UIFocusItem, CALayerDelegate
{
open class UIViewController : UIResponder, NSCoding, UIAppearanceContainer,
UITraitEnvironment, UIContentContainer, UIFocusEnvironment {
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