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Gweith Gwen Ystrat ( in English : The Battle of Gwen Ystrad , is a late Old Welsh or Middle Welsh heroic poem found uniquely in the Book of Taliesin , where it forms part of the Canu Taliesin , a series of poems attributed to the 6th-century court poet of Rheged , Taliesin .
 Taliesin, Taliesin, Taliesin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Taliesin, Taliesin, Taliesin