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One week in early 1972 , he stood in for Alan Freeman on Pick of the Pops '' , as well as sitting in for the likes of David Hamilton and Terry Wogan through the 1970s .
 Alan Freeman, Pick of the Pops, David Hamilton, Terry Wogan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alan Freeman, Pick of the Pops, David Hamilton, Terry Wogan