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However , as Carl Sagan argued , it is very difficult to be certain whether a statement that applies to all life on Earth will turn out to apply to all life throughout the universe .
 person: Carl Sagan
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: Carl Sagan 
Answer:
 person: Carl Sagan