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Pakistan 's government publicly condemns these attacks , but has secretly shared intelligence with the United States and also allegedly allowed the drones to operate from Shamsi Airfield in Pakistan until 21 April 2011 , when 150 Americans left the base .
 Pakistan, Pakistan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pakistan, Pakistan