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For example , Robert Nozick held that a certain set of minimal rules , which he calls " side-constraints , " are necessary to ensure appropriate actions .
 person: Robert Nozick
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 Nozick 
Answer:
 person: Robert Nozick