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Maestri probably knew the engravings as his inscriptions beneath the framing lines ( describing the different types of love ) are similar to those reported by Piranesi and Piroli .
 Maestri, Piranesi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Maestri, Piranesi