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On bough, which goeth and another cometh.”
                                
                                
                                
                                
                            
                                        
                                        Canto XXVI, lines 137–138 (tr. Longfellow). 
The Divine Comedy (c. 1308–1321), Paradiso
                                    
 
        
     
                             
                             
                             
                             
                            