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He studied Organ ( with G.D. Cunningham ) and Composition ( with William Alwyn ) at the Royal Academy of Music in London .
 G.D. Cunningham, William Alwyn, Royal Academy of Music, London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 G.D. Cunningham, William Alwyn, Royal Academy of Music, London