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166: Mainline

With the introduction of instance variables, you now know of three elements that can appear in class definitions:

A class definition 
*--------------------* 
|                    | 
| Class methods      | 
|                    | 
| Class variables    | 
|                    | 
| Instance variables | 
|                    | 
| .                  | 
| .                  | 
| .                  | 
|                    | 
*--------------------*