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It has been claimed that animal trainer Mary Chipperfield released three pumas into the wild following the closure of her Plymouth zoo in 1978 , and that subsequent sightings of the animals gave rise to rumours of the Beast .
 Mary Chipperfield, Plymouth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mary Chipperfield, Plymouth