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In conformal field theory and representation theory , a " W-algebra " is an algebra that generalizes the Virasoro algebra .
 person: Virasoro
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: Virasoro 
Answer:
 person: Virasoro