[{'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. Period of possession and use of personal information Company shall in principle destroy the user's personal information immediately when the purpose of the collection and use of personal information is achieved. However, in the case that needs to be kept pursuant to the relevant laws and regulations, the personal information may be stored for a period of time."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]