[{'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: Changes to this Privacy Statement This statement sets out our current Privacy Policy. This policy may change from time to time. The current version of our Privacy Policy is available from http://metrotrains.com.au. The current version of our Privacy Policy replaces all previous versions of the policy."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]