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In 1934 , Winston Churchill is deep in his wilderness years , and struggling to complete his biography of his ancestor the Duke of Marlborough , which he hopes will revive his fortunes .
 Winston Churchill, Marlborough
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Winston Churchill, Marlborough