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He made his major league debut for the Washington Nationals on September 6 , 2011 , appearing in three games during the season , pinch-hitting three times , without getting on base .
 Washington Nationals
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Washington Nationals