84807
It was shown to the public at trade shows in London and Chicago in January , 1977 , and released for sale in 1978 .
 location: London; location: Chicago
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, Chicago 
Answer:
 location: London; location: Chicago