[{'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: In order to enforce our Terms of Use and to prevent abuse of the Services, we may retain basic account information reasonably necessary to ensure a former user whose account has been terminated for breach of the Terms of Use does not open a new account and profile in further breach of our Terms of Use. We may also retain additional information where we reasonably believe that we are legally obligated to do so (such as where such information may be relevant for a law enforcement investigation)."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]