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The first Italian libretto explicitly based on Shakespeare ’s play was by M. M. Marcello , for Marchetti ’s Romeo e Giulietta ( 1865 , Trieste ) .
 Shakespeare, Giulietta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Shakespeare, Giulietta