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Qingdao Metro ( ) is a metro system under construction as of 2009 in the city of Qingdao , Shandong province in China .
 Qingdao, Qingdao, Shandong, China
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Qingdao, Qingdao, Shandong, China