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His original intention was to use the tramroad to convey limestone sourced from quarries near Penwyllt to the farms of the Usk valley and Mynydd Epynt where its soil-improving qualities would be appreciated .
 Penwyllt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Penwyllt