This is a note
                                                                                                                                                                                                                                                                
                                                                        yes                                                                                                                                                                 no                  
                                                                                                                    condition?                                                                                                                                  
                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                
                     activity A                                                                                                                                                               activity B