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the president of the united states coming for a brief two - day summit with the british prime minister tony blair .
 the united states, british, the president of the united states, the british prime minister tony blair, british prime minister
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 the united states, british, the president of the united states, the british prime minister tony blair, british prime minister