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