[{'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: HealthVault maintains a full history of each access, change or deletion by users and services, which includes the date, action and name of the person or service. Custodians of records can examine the history of those records."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]