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He then specialised in Communist affairs and held the following positions : He retired from the diplomatic service in 1971 and was appointed Master of Corpus Christi College , Cambridge .
 Corpus Christi, 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:
 Corpus Christi, Cambridge