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Line 1 of the Tianjin Metro ( ) runs 26.2 km from the north-west to the south-east of downtown Tianjin and serves 22 stations .
 Tianjin, Tianjin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tianjin, Tianjin