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Joining the staff of the Mersey Docks and Harbour Board in Liverpool , he became an assistant engineer .
 organization: Mersey Docks and Harbour Board; location: Liverpool
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: Mersey Docks and Harbour Board, Liverpool 
Answer:
 organization: Mersey Docks and Harbour Board; location: Liverpool