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Borophagina is a hypocarnivorous subfamily or clade of Borophaginae , a group of terrestrial canine s which inhabited most of North America during the Hemingfordian stage of the Early Miocene subepoch to the Zanclean stage of the Pliocene epoch 20.6 — 3.6 Mya existing approximately .
 North America
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 America