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He went to Fettes College in Edinburgh , then Edinburgh University at the age of 15 , followed by Trinity College , Cambridge , in 1923 .
 Fettes College, Edinburgh, Edinburgh University, Trinity College , 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:
 Fettes College, Edinburgh, Edinburgh University, Trinity College , Cambridge