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Studies of the brain have shown the similarities with Condylarthra , The ptolemaiidans , a mysterious clade of mammals with uncertain affinities , may actually be stem-aardvarks , either as a sister clade to Tubulidentata or as a grade leading to true tubulidentates .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None