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It was a small , narrow-skulled canid which may have given rise to grey wolves and coyote s. Some larger , broader-skulled C. lepophagus fossils found in northern Texas may represent the ancestral stock from which true wolves derive .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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