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Ukek marked the half-way distance between Sarai , the capital of the Golden Horde , and Bolghar , the former capital of Volga Bulgaria .
 Ukek, Sarai, Bolghar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ukek, Sarai, Bolghar