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The album 's hard rock edge included conspicuous guitar contributions from Robert Fripp , Chuck Hammer , and Pete Townshend .
 Robert Fripp, Chuck Hammer, Pete Townshend
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Fripp, Chuck Hammer, Pete Townshend