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The Zhovkva Castle ( ; ) occupies the principal square of the town of Zhovkva in Ukraine .
 Zhovkva, Zhovkva, Ukraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zhovkva, Zhovkva, Ukraine