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Fought from 28 to 30 June 1651 , the battle took place in the province of Volhynia , on the hilly plain south of the Styr River .
 Volhynia, Styr River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Volhynia, Styr River