[{'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: − 13. Changes to this Policy From time to time we may make changes to this privacy policy, which will be posted on our web sites and relevant communications channels. You are advised to check our web sites regularly to view our most recent privacy policy. We last updated our privacy policy on January 20, 2017, the key changes made are recorded in a change log here."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]