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To create the Mysteron rings , the crew used the advice of producer Reg Hill , who suggested that a transparency be made that could be panned across the sets using a slide projector .
 person: Reg Hill
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: Reg Hill