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I just listed : Harry Potter and the Philosopher 's Stone ( Unabridged 6 Audio Cassette Set ) [ cassette ] Rowling , J.K . , Fry , Stephen [ Nov 01 , 1999 ] , for £ 12.75 via {@Amazon@} {{URL}}
 Harry Potter, Rowling , J.K, Fry , Stephen, Amazon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 Harry Potter, Rowling , J.K, Fry , Stephen, Amazon