Use ATLEAST (or ATL) to require that a word or words appear ‘at least’ so many times in a document. Use ATLEAST when you would only like documents that contain an in-depth discussion on a topic rather than just a mention.
For example, to find in-depth discussion in Commentary regarding contributory negligence:
This search requires "contributory negligence" to appear in every document at least 5 times. You can use any number from 1 to 255 with the ATLEAST command.