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During the close season , Burrell has also been working hard to build up his fitness and has been training with the club 's sister club Leeds Rhinos to gain some match experience .
 Burrell, Leeds Rhinos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Burrell, Leeds Rhinos