[{'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 POLICY We may from time to time revise or add specific instructions, policies and terms to this Privacy Policy. These instructions, policies and terms form part of this Privacy Policy. Where we consider that any changes to this Privacy Policy are reasonably material, we will notify you via WeChat (including via direct messaging or the WeChat website), other direct communication to you, or other means prior to the change becoming effective."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]