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The primary language parsing program in this project was called SHRDLU , which was capable of carrying out a somewhat natural conversation with the user giving it commands , but only within the scope of the toy environment designed for the task .
 None
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:  
Answer:
 None