[{'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: 12. Changes and updates to this Privacy Policy (a) This Privacy Policy may be revised, amended or modified periodically. Please re-visit this page to stay in touch with any changes. Your access of the Services signifies your acceptance and agreement to this Privacy Policy (as may be amended or revised from time to time)."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]