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The utaki , or more specifically its , is one of a number of sites which together comprise the UNESCO World Heritage Site officially described as Gusuku Sites and Related Properties of the Kingdom of Ryukyu , and has been designated an Important Cultural Property by the Japanese national government .
 UNESCO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 UNESCO