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BLITZER What about the length of the U . S . military presence in Iraq , Senator Lugar ?
 U . S, Iraq, U . S . military, Senator, Senator Lugar
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:
 U . S, Iraq, U . S . military, Senator, Senator Lugar