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He also appears several times as a peripheral character in John Maddox Roberts ' " SPQR " series .
 person: John Maddox Roberts
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 Maddox Roberts 
Answer:
 person: John Maddox Roberts