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After contributing to George Dunning ’s animated feature Yellow Submarine in 1968 , he returned to freelance work in the United Kingdom , the United States and Canada .
 George Dunning, United Kingdom, United States, Canada
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 George Dunning, United Kingdom, United States, Canada