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Traditionally , saber-toothed cats have been artistically restored with external features similar to those of extant felids , by artists such as Charles R. Knight in collaboration with various paleontologists in the early 20th century .
 person: Charles R. Knight
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: Charles R. Knight 
Answer:
 person: Charles R. Knight