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But in such close - quarters fighting , they would lose much of the technological advantage of their air supremacy , which would have to be curtailed because bombing in a city can cause large civilian casualties .
 a city, they, their, civilian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 a city, they, their, civilian