condition1                                                   
                                                                                             
                                                                                          yes
                                                                                             
                                                                                             
                                                                                             
                                                                                A            
                                                                                             
                                                                                             
                                                                                             
                                                                                             
                                                                                          no 
                                                                                             
                                                                                             
                                                                                             
                                                                                B