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Candi Merak is a relic of an ancient temple complex in Klaten Regency , Central Java , consisting of a main building and three ancillary temples , dating from the 9th or 10th century , from the Mataram Kingdom .
 Klaten Regency, Central Java, Mataram Kingdom
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Klaten Regency, Central Java, Mataram Kingdom