[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: UPDATING OR DELETING YOUR PERSONALLY-IDENTIFIABLE INFORMATION You have at all times the right to delete your account with Duolingo by following the instructions available through the Service. After your account is deleted we will retain aggregate or anonymous data collected through the Service, including Activity Data, which may be used by Duolingo and shared with third parties in any manner. Information associated with the Duolingo English Test, including examination results and your Testing Video, may be collectively deleted from your Duolingo account, but anonymized examination data, including your examination results and Testing Video, may be kept indefinitely by Duolingo to improve the examination and for research and analysis."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]