no
                                     condition1                                                                                                                                              condition2                                                                                                         
                                                                                                                                                                                                                                                                                                                
                                                                                               yes                                                                                                                                              yes                                                             
                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                
                                                                                     A                                                                                                                                                B