[{'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: Stop receiving HeroCraft marketing emails by clicking the unsubscribe link included at the bottom of HeroCraft marketing emails. You cannot opt out of certain emails we need to send you relating to normal business operations (for example, we may email you to deliver a content that your bought using a HeroCraft online service). Pinterest"}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]