? 1,2,a                                                                         
?Redo from start                                                                
? 1                                                                             
?Redo from start                                                                
? 1,2                                                                           
?Redo from start                                                                
? 1,2,3                                                                         
DONE                                                                            
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
