February 19, 2023 - Spent most of today confirming the Function and Operations on a simulator and boy was my brain in a fog for awhile. I am shy of 70 years by just a few. I caught myself up to where I understand about 99 percent of what is shown below but two or three still do not sim out to what I am thinking they should be so I still need a bit more study time with this. My wife just says - Better you than me....

This is what the 74181 can do........ And what the completed 74LL181 will do.