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By the first century BC brass was available in sufficient supply to use as coinage in Phrygia and Bithynia , and at a number of sites in Britain .
 Phrygia, Bithynia, Britain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Phrygia, Bithynia, Britain