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The Planck epoch was succeeded by the grand unification epoch beginning at 10 seconds , where gravitation separated from the other forces as the universe 's temperature fell .
 person: Planck
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: Planck 
Answer:
 person: Planck