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The center has a staff of approximately a dozen people supporting six main programs : Energy Security and Climate Change , Strategic Studies , US-Russia Relations , Immigration and National Security Studies , China Studies , and Regional Security ( Middle East , Caspian Basin and South Asia ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None