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Director Robert Zemeckis said that , initially , a sequel was not planned for the first film , but its huge box office success led to the conception of a second installment .
 person: Robert Zemeckis
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: Robert Zemeckis 
Answer:
 person: Robert Zemeckis