yes                                                        
                                    condition1                                                                                                                                                                        A
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                              no                                                                                                                       
                                                                                                                                                                                                                       
                                                                                                                                                                                                                       
                                                                                    B