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Belgium was represented by Dream Express , with the song ' " A Million in One , Two , Three " , at the 1977 Eurovision Song Contest , which took place in London on 7 May .
 location: London
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: London 
Answer:
 location: London