| Interface | Description | 
|---|---|
| Parallelogram | 
 A common interface for parallelogram implementations 
 | 
| Positionable | 
 A common interface for objects that can be positioned with an x and y
 coordinate 
 | 
| PositionChangeListener<T extends Positionable> | 
 A common interface for implementing position listeners 
 | 
| Shape | 
 A common interface for shapes 
 | 
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