: These terms suggest that the content being sought is intended for adults and possibly categorized as being of high quality or popularity ("best").
: Limits results to directories containing files with the .avi video format extension.
: Limits results to the Audio Video Interleave movie file format. adult best
: This tells Google to only show pages that have "index of" in their title, which is the default headline for a server that doesn't have a standard homepage and is instead showing a list of its raw files.
: Explain the use of advanced search operators (like intitle: and index of ) to find information not intended for public viewing.
Pick one of the above or tell me a different, lawful topic to cover.