[{'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: For technical reasons, it may be impossible for us to determine whether you have stopped using the UCWeb Services. For the mobile applications, it may also be impossible for UCWeb to determine whether you have deleted the application. In such cases, we reserve the right to remove your account and the information you have provided us if you have not used the Services for an extended period of time."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]