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The actual rate , however , was usually lower , and fluctuated depending on the changing price of silver : contemporary sources indicate actual rates of 12.5 , 13 , or 15 basilika to the hyperpyron .
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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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