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While the career of Fiachu Muillethan may be entirely legendary , that of his supposed great-grandson Conall Corc , the true founder of the Eóganachta , may preserve an amount of historical fact .
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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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