[{'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: 19 Waivers of our rights 19.1 Our failure to exercise or enforce any of our rights under these terms does not waive our right to enforce such right. Any waiver of such rights shall only be effective if it is in writing and signed by us."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]