> much less use in their day job Yes, some are indeed very relevant. In one of my previous businesses, we built a search engine where we used DAWGs (Directed A

> much less use in their day job Yes, some are indeed very relevant. In one of my previous businesses, we built a search engine where we used DAWGs (Directed Acyclic Word Graphs) [I didn't do this part]. And they worked really, really well, in fact they work well to this day.