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During 1985 - 87 , the line to Norwich was electrified and through electric working commenced in May 1987 .
 location: Norwich
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: Norwich 
Answer:
 location: Norwich