What are the three main categories of Design Patterns?

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The three main categories are:

Creational Patterns: Deal with object creation mechanisms, trying to create objects in a manner suitable to the situation (e.g., Singleton, Factory, Builder)
Structural Patterns: Deal with object composition and relationships between entities (e.g., Adapter, Decorator, Facade)
Behavioral Patterns: Focus on communication between objects and the assignment of responsibilities (e.g., Observer, Strategy, Command)

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