[{'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: (a) Commercial E-mails You may choose not to receive commercial e-mails from us by following the instructions contained in any of the commercial e-mails we send or by logging into your account and adjusting your e-mail preferences. Please note that even if you unsubscribe from commercial email messages, we may still e-mail you non-commercial e-mails related to your account and your transactions on the Site. You may update your subscription preferences at any time."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]