[{'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: Opting Out of Promotional Emails from FGFF If you want to stop receiving promotional e-mails from FGFF, click on the "unsubscribe" link in any promotional email from FGFF. Please note that once we receive your request, it may take an additional period of time for your opt-out to become effective. Your unsubscribe or e-mail preference change will be processed promptly, and in no event longer than thirty business days.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]