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On 2 March 2010 he put out a collaborative LP with Italian rapper , producer and DJ , Esa a.k.a. El Presidente , formerly with the group Otierre a.k.a. OTR .
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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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