no                                 Is a = b?                                                                                                 
                                                                                                                                                                                              
                                                                                                                                            yes                                               
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                              Do something                                                                                                                                    
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                            no
                                                                                                Is d = c?                                                                                     
                                                                                                                                                                                              
                                                                                                                                            yes                                               
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                           TestNode                                                                                           
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                                                                                                              
                                                                                                Clean up