[{'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: 'Block all cookies' blocks all cookies that websites try to save to your computer. 'Block only third party cookies' blocks third party cookies, which are saved by external web services, such as ads embedded on webpages you have navigated to."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]