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Adam Anhang Uster ( March 8 , 1973-September 23 , 2005 ) was a businessman and founder of an Online gambling enterprise ; he was murdered at the intersection of Calle San Justo and Calle Luna in Old San Juan , Puerto Rico on September 2005 .
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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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