[{'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: Data Retention. For interest-based advertising, we retain data for no more than 13 months, unless we obtain your consent to retain the data longer."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]