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Pont-y-tŷ-pridd took its name from the original bridge of the same name , however very little is known of that ancient ford with stepping stones , which ran along side the current Old Bridge , and was used only when the river ran low .
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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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