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Horton at first advanced westwards through Wales towards Carmarthen , but then had to march hastily to Brecon to forestall an uprising there .
 Horton, Wales, Carmarthen, Brecon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Horton, Wales, Carmarthen, Brecon