[{'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: Customer Proprietary Network Information (CPNI) Customers of Verizon telecommunications and VoIP services may choose to limit the use and sharing of CPNI for Verizon's marketing services outside of services you currently have. Notice about our use and sharing of CPNI and the choices you have may be provided on your monthly bill, over the phone, via text, in contracts or in other ways."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]