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It is carved in shallow relief , a technique often employed by the master-sculptor of the early 15th century , Donatello , and others such as Desiderio da Settignano .
 Donatello, Desiderio da Settignano
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Donatello, Desiderio da Settignano