|   |   |                  
                  +   +   +                  
                |---|---|---|                
                |   |   |   |                
      |   |   | |   |   |   | |   |   |      
      +   +   +  | | | | | |  +   +   +      
    ------- ------- /---\ ------- -------    
    |      =|      =| @ |=      |=      |    
    ------- ------- |---| ------- -------    
      ^   ^   ^  | | | | | |  ^   ^   ^      
                |   |   |   |                
                |   |   |   |                
                |---|---|---|                
                  ^   ^   ^                  
                                             
                                             
                                             
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