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He was educated at St Christopher School , a progressive school in Letchworth , Hertfordshire ( 1949-1959 ) , and at St John ’s College , Cambridge , where he studied English Literature and Modern Languages ( 1960-1963 ) .
 Letchworth, Hertfordshire, Cambridge
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Letchworth, Hertfordshire, Cambridge