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In a 2005 study of 127 world cities , the Economist Intelligence Unit ranked the city first ( in a tie with Vancouver and San Francisco ) for the world 's most livable cities .
 Economist Intelligence Unit, Vancouver, San Francisco
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Economist Intelligence Unit, Vancouver, San Francisco