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During the Camillan era , they fought in a shallow phalanx formation , supported by light troops .
 person: Camillan era
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: Camillan era 
Answer:
 person: Camillan era