Suppose a nimble-fingered user enters a (duplicate) city name but immediately realizes his mistake and fixes it.
假设一个输入速度很快的用户输入一个（重复的）城市名，但是马上意识到了错误并纠正了错误。
Suppose a nimble-fingered user enters a (duplicate) city name but immediately realizes his mistake and fixes it.
假设一个输入速度很快的用户输入一个（重复的）城市名，但是马上意识到了错误并纠正了错误。
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