[{'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: Users may at any time decline to receive email advertising or a newsletter, and can withdraw consent with immediate effect. The simplest way for a user to do this is to use the special link or the email function and to specify its preferred settings."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]