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Mathisen 's main source of inspiration was Fats Waller , both his piano play and his singing , but the later years of his career saw some Bebop influence .
 person: Mathisen; person: Fats Waller
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: Mathisen, Fats Waller 
Answer:
 person: Mathisen; person: Fats Waller