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Brachial plexus The Brachial plexus ( plexus brachialis ) is formed by the ventral rami of C5-C8-T1 spinal nerves , and lower and upper halves of C4 and T2 spinal nerves .
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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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