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A drama specially adapted for children based on the story of Culhwch and Olwen from the Mabinogian was staged at Narberth Castle when it was reopened to the public in 2005 .
 Narberth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Narberth