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An instruction set simulator ( ISS ) is a simulation model , usually coded in a high-level programming language , which mimics the behavior of a mainframe or microprocessor by " reading " instructions and maintaining internal variables which represent the processor 's registers .
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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:
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