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