CCCC      
              rrrrCCCCC    
             rrrrrrCCOCC   
              rrrrrrOOCC   
              OCOOrOOOCCC  
           bOOOrOOrOOrrCCC 
           b  OOOOOOrrr  C 
 ..........bBOOOOOCCCCC    
...........bBOOOrrrrrrCC   
 ..........bBbOOrrrrrrrC   
           b   CrrrrrrrCC  
           bb rrCCCrrrCCCC 
              rrrrrCCCCCCrr
             rrCCCCCCCCCrrr
            rrrr       rrr