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The Penkovka culture is an archaeological culture dating from about the 5th to the 7th or 8th century CE , named after Penkovka ( ) or Pen ' kivka ( ) , a site near the middle Dnieper River now under the Kremenchuk Reservoir .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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