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The earliest known examples are the prehistoric rock and cave art pieces , most prominent in North Yorkshire , Northumberland and Cumbria , but also feature further south , for example at Creswell Crags .
 North Yorkshire, Northumberland, Cumbria, Creswell Crags
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 North Yorkshire, Northumberland, Cumbria, Creswell Crags