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On 23 June 2006 , Uzbekistan became a full participant in the CSTO and its membership was formally ratified by its parliament on 28 March 2008 .
 Uzbekistan, CSTO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Uzbekistan, CSTO