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It also formed a joint-venture company with Vertex Group and China Southern Power Grid for the preparation of electricity supply to Hong Kong .
 organization: China Southern Power Grid; location: Hong Kong
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: China Southern Power Grid, Hong Kong 
Answer:
 organization: China Southern Power Grid; location: Hong Kong