[{'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 Zynga If you want to stop receiving promotional e-mails from Zynga, click on the "unsubscribe" link in any promotional email from Zynga or visit the e-mail preference page. 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 ten business days.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]