A                                               inc                                            B                                                                        C                                                                            D                            no                                      
                                                                                                                                                                                                                                                                                                                                                                
                                                yes                                                                                           out                                                                       yes                                                                         yes                                                         
                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                                
                                AA                                                                                             BB                                                                       CC                                                                           DD                                                                         
                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                              EE