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The Western Sydney Derby is a rugby league rivalry between NRL clubs the Penrith Panthers and Parramatta Eels .
 NRL, Penrith Panthers, Parramatta Eels
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NRL, Penrith Panthers, Parramatta Eels