long condition                                                                                                                                                                              
                                                                                                                                                                      is                                                                                                               
                                                                                                                                                        long                                                                                                                           
                                                                                                                                                                                                                                                                                       
                                                                                                                                                                                                                                                                                       
                     Activity                                                                                                                                                                                                               Activity                                   
                                                               A                                                                                                                                                                                                                      B