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He started the following season , 2009 – 10 , at Luton before returning to Grays Athletic on 17 August , where he made six appearances in a four-month loan spell .
 Luton, Grays Athletic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Luton, Grays Athletic