| Interface | Description | 
|---|---|
| System<T extends Entity> | 
 A common interface for implementing  
Systems as part of the Entity-Component-System pattern | 
| Class | Description | 
|---|---|
| Box2DSystem | 
 Wrap Box2D into an implementation of  
System | 
| ScreenManagerSystem | 
 An implementation of  
ScreenManager as a System suitable for
 the Entity-Component-System architecture | 
| UUIDSystem | 
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