[{'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: 8. General Rules 8elements may vary the terms and conditions of this Agreement or withdraw any or all of the Content without notice from time to time. Any alteration or addition to this Agreement shall take effect immediately once posted on the Site. You are responsible for checking the Site for any such amendments. 8elements reserves the right to change the charges for each download or service of the Content from time to time. Any alteration or addition to the charges shall take effect immediately once posted on the Site."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]