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In 2004 they relocated to nearby Ridley Park , Pennsylvania , adopting the name Delaware Valley Mantarays .
 Ridley Park , Pennsylvania, Delaware Valley Mantarays
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ridley Park , Pennsylvania, Delaware Valley Mantarays