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As technology moves forward to take advantage of more complex channel characteristics such as MIMO , the channel model ing needed to accurately emulate the radio environment becomes even more critical to a test setup .
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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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