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He also created life-sized monuments in bronze for the African Burial Ground National Monument in New York ( using three of the actual skulls found on the site to give faces to the unknown slaves who had been buried there ) , a monument for slain police officers in New Jersey , and a Holocaust obelisk .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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