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With his advances in the atomic theory of matter , John Dalton devised his own simpler symbols , based on circles , to depict molecules .
 person: John Dalton
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: John Dalton 
Answer:
 person: John Dalton