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Though the Joker 's origin is never shown in the series , some of his past is seen in the feature film " Batman : Mask of the Phantasm " .
 person: Joker
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: Joker