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