condition                                                                   
                                                                                                                                                                                                         
                                                                                                                                                                               yes                       
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                           ...                                           
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                condition                                                                                                                               condition                        
                                                                                  yes                                                                                                                 yes
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                                                                                                                                                                         
                                                              ...                                                                                                                                  ...