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The series also features two fictional species : Chao , which function as digital pets and minor gameplay elements , and Wisps , which function as power-ups .
 person: Chao
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Chao