[{'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: 6. Changes to the privacy policy This Privacy Policy will be periodically revised and may be changed with or without notice. The updated Privacy Policy will be posted on the UCWeb sites. By using or continuing to use the Services you agree to review the Privacy Policy periodically such that you are aware of any modifications. If you do not agree to the Terms of Use or this Privacy Policy, you should not use any of the UCWeb Services."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]