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1. 2.1 Object oriented concepts
2.1.1 Properties, methods and basics of objects and classes in Kotlin 2.1.2 Named parameters, constructors.
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2. 2.2 open classes and inheritance.
2.2.1 Named parameters and Default values 2.2.2 Open and Abstract 2.2.3 Interface 2.2.4 Getters and Setters 2.2.5 visibility of properties, methods and class