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Diego Sanchez ( born December 31 , 1981 ) is an American mixed martial artist with a background in wrestling and Gaidojutsu , system of submission wrestling developed by his longtime trainer Greg Jackson .
 Diego Sanchez, Gaidojutsu, Greg Jackson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Diego Sanchez, Gaidojutsu, Greg Jackson