yes                                                                                                                                                                                                                                                                   no
                                                                                                                                                                          condition is true                                                                                                                                                                                                           
                                                                                                                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                                   action C                           
                                                                                                                                                                                                                                                                                                                                                                                                      
                                      action A                                                                                                                              action B