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https://docs.swift.org/swift-book/LanguageGuide/Inheritance.html Inheritance — The Swift Programming Language (Swift 5.7) Inheritance A class can inherit methods, properties, and other characteristics from another class. When one class inherits from another, the inheriting class is known as a subclass, and the class it inherits from is known as its superclass. Inheritance is docs.swift.org 클래스는 ..