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Flavors is a part of the Common Lisp Object System (CLOS), the object-oriented metaobject system in Common Lisp. The system lets users define new classes and methods to extend the language for specific purposes. In CLOS, objects are instances of classes, which can inherit attributes from superclasses to support modular design and code reuse. Classes in Flavors are expressed in terms of prototypes, where each class is an instance of another class called a metaclass — providing more flexibility than most other object systems at the time it was created.