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In S.O. S , Grace takes part in an APO mission to infiltrate CIA headquarters in Langley , Virginia in order to locate Sydney , who has been kidnapped by Prophet Five .
 Langley , Virginia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Langley , Virginia