[{'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: Opt-Out - Promotional Communications Tango allows you to choose not to receive promotional email messages from the Service or its service providers. You may opt-out by following instructions in the message sent by Tango or its service providers on how to unsubscribe from that particular mailing. You may also opt-out by contacting us at privacy@tango.me."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]