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Groovy enables one class to extend another. We can test for extended classes with the 'in' operator, just like with implemented interfaces:

Public instance fields, properties, and methods defined on an extended class are also available on the extending class:

We can use the 'private' and 'protected' modifiers to restrict the visibility of instance methods, properties, and fields:

Public static fields, properties, and methods are inherited by extending classes:

We can make static methods, properties, and fields private or protected:

TO BE CONTINUED

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