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The Cantiorix Inscription is a stone grave marker of the early post-Roman era found near Ffestiniog in north Wales and now at the church at Penmachno .
 Ffestiniog, Wales, Penmachno
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ffestiniog, Wales, Penmachno