91521
It was tested only in the Chicago and San Francisco areas that used a dedicated T1 line , connected directly to Midway 's Chicago headquarters .
 Chicago, San Francisco, Midway, Chicago
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chicago, San Francisco, Midway, Chicago