[{'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: 4. Changes to our Privacy Policy: From time to time, it may be necessary for FDG to change this privacy policy. If we change our policy, we will post the revised version here, so we suggest that you check here periodically for the most up-to-date version of our privacy policy. Rest assured, however, that any changes will not be retroactively applied and will not alter how we handle previously collected information."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]