[{'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: Depending on the circumstances and applicable laws, BlackBerry may refuse to process certain access requests (e.g. access requests that are unreasonably repetitive or systematic, would be extremely impractical or require disproportionate technical effort)."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]