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Baku Metro was opened in November 1967 and includes 3 lines and 25 stations at present ; 170 million people used Baku Metro over the past five years .
 Baku Metro, Baku Metro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baku Metro, Baku Metro