Input (grade 11): The French writers' duo Henri Meilhac and Ludovic Halévy wrote a large number of opera and operetta libretti for the likes of Jacques Offenbach, Jules Massenet and Georges Bizet.
Output (grade 12): Two French writers called Henri Meilhac and Ludovic Halévy wrote a large number of opera and operetta libretti for the composers Jacques Offenbach, Jules Massenet and Georges Bizet.