graph TD
    A[Design Patterns] --> B[Creational]
    A --> C[Structural]  
    A --> D[Behavioral]
    
    B --> B1[Singleton]
    B --> B2[Factory]
    B --> B3[Builder]
    
    C --> C1[Adapter]
    C --> C2[Decorator]
    C --> C3[Facade]
    
    D --> D1[Observer]
    D --> D2[Strategy]
    D --> D3[Command]