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The idea that the arcuballista was a crossbow is based on the fact that Vegetius refers to it and the " manuballista " , which was torsion powered , separately .
 person: Vegetius
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: Vegetius 
Answer:
 person: Vegetius