[{'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: All Sales Final: Downloading and Risk of Loss; Availability of eBooks. All sales of eBooks are final. We do not accept returns of eBooks. Once you have purchased eBooks, we encourage you to download it promptly. If you are unable to complete a download, please contact customer service within 30 days of the payment. The ebook will be removed from your library and the amount that was charged during the payment will be refunded in the form of store credit. The eBooks will also be replaced in cases of genuine technical errors as mentioned in the replacement policy."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]