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" This concept was fleshed out later in the book " Future Shock " by Alvin Toffler .
 person: Alvin Toffler
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: Alvin Toffler 
Answer:
 person: Alvin Toffler