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The similarity was reinforced by the name of the new coin : the ducato , the " coin of the doge " , became the basilikon , the " coin of the basileus " , although the contemporary Greek sources usually call both doukaton .
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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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