[{'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: 21. Special Note about XFINITY Wi-Fi In addition to the information collection and use practices described in this Web Services Privacy Policy, the following additional practices apply to XFINITY Wi-Fi ("Wi-Fi Service"): Improving and Operating the Wi-Fi Service Comcast may record non-PII about your use of the Wi-Fi Service for purposes of improving the efficiency and effectiveness of the Wi-Fi Service and to automate repeated logins to the Wi-Fi Service from the same device. Besides the location of the Wi-Fi Service access point to which you login, and aggregated usage data from that access point, we record only the media access control address ("MAC Address") associated with the device you use to access the Wi-Fi Service to enable you to log back in during the time you have signed up for access, and we may track the time(s) and location(s) of the access point(s) you use to access the Wi-Fi Service. The MAC Address is a short series of numbers unique to your phone, laptop, tablet or other Wi-Fi-enabled device. It does not contain any of your PII.'}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Contact_ZIP_1stParty, Demographic_Gender_1stParty, Identifier_MAC_1stParty, Location_1stParty, Location_WiFi_1stParty.'}]