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The Xi Effect is a science fiction short story by astronomer and author Robert S. Richardson ( as ( Philip Latham ) .
 person: Robert S. Richardson
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: Robert S. Richardson 
Answer:
 person: Robert S. Richardson