[{'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: You can remove your data anytime you want by sending a request to Tango at privacy@tango.me. Your data will no longer be available to your Tango contacts. If you ask us to delete your account, we will use commercially reasonable efforts to remove your data from our servers, however certain information may be retained in our back-up or archival systems. Please note that, after your account is closed, we may retain certain information associated with your account, including for analytical purposes as well as for record keeping integrity."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]