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Early work From 1977 to 1982 , he was the senior producer of PBS ' The Big Blue Marble , which won an Emmy Award for Outstanding Children 's Series .
 organization: PBS
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: PBS 
Answer:
 organization: PBS