[{'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: In addition, we create a unique user ID to track your use of our Service. This unique user ID is stored in connection with your profile information to track the Supercell games you are playing."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]