First 35 stages of RCA2
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 X X                                                                                                                                        
     X                                                                                                                                      
 X X X X                                                                                                                                    
 X   X   X                                                                                                                                  
         X X                                                                                                                                
 X   X       X                                                                                                                              
 X X X X X X X X                                                                                                                            
     X       X   X                                                                                                                          
 X X     X X     X X                                                                                                                        
 X       X           X                                                                                                                      
                 X X X X                                                                                                                    
 X       X       X   X   X                                                                                                                  
 X X     X X             X X                                                                                                                
     X       X   X   X       X                                                                                                              
 X X X X X X X X X X X X X X X X                                                                                                            
 X   X       X   X   X       X   X                                                                                                          
         X X             X X     X X                                                                                                        
 X   X   X       X   X   X           X                                                                                                      
 X X X X         X X X X         X X X X                                                                                                    
     X               X           X   X   X                                                                                                  
 X X             X X                     X X                                                                                                
 X               X               X   X       X                                                                                              
                                 X X X X X X X X                                                                                            
 X               X                   X       X   X                                                                                          
 X X             X X             X X     X X     X X                                                                                        
     X               X           X       X           X                                                                                      
 X X X X         X X X X                         X X X X                                                                                    
 X   X   X       X   X   X       X       X       X   X   X                                                                                  
         X X             X X     X X     X X             X X                                                                                
 X   X       X   X   X       X       X       X   X   X       X                                                                              
 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X                                                                            
     X       X   X   X       X       X       X   X   X       X   X                                                                          
 X X     X X             X X     X X     X X             X X     X X                                                                        
 X       X       X   X   X       X       X       X   X   X           X