[{'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: To collect aggregated data from your chat history. We use the data to build language models which help us improve the Service. We will only collect this data on an aggregated basis, and in a manner which does not reveal any personally identifiable information about any individual user. We will use this data to help us understand our users' interests, analyze trends, and customize the user experience."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]