First 35 stages of RCA1
 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