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After graduating from Harvard Law School , Alexander opened his own firm in his hometown of Philadelphia , where he not only became one of the most prominent attorneys , but also stood at the forefront of the city ’s civil rights struggle .
 person: Alexander
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: Alexander 
Answer:
 person: Alexander