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Gwynedd 's traditional territory included Anglesey ( Ynys Môn ) and all of north Wales between the River Dyfi in the south and River Dee ( Welsh Dyfrdwy ) in the northeast .
 Gwynedd, Anglesey, Ynys Môn, Wales
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gwynedd, Anglesey, Ynys Môn, Wales