Hello, Ellen.
Well, I've definitely been using it and love it, I mean love it. However, I don't use it for the majority of my phrases, because A - I started years ago with others that are now embedded in my brain and they work for me, and B - I still don't use it all the time, just with certain ones that my brain seems to instantly signal me, would be perfect for it.
It's my opinion that with any system, if we input enough phrases, sooner or later duplicates will arise. It's just inevitable. You might want, for your example, to have admtthd and admtthn, something like that. Or, just put any different ending letter for your short form. I love IT for the ease of doing this and not having to think about it. Of course, at the same time, I understand exactly what you are saying, about preferring to never have to look. Lots of paradoxes, and I think we all get it, doing this kind of work!

Often, not necessarily with this system but anything, I now will put the whole last word in the short form, knowing I won't have to type it out. Like, hmmm, say I have an entry for std and now I want secondary to dehydration in there. Well, I just quickly put stdehyd or something like that, even the whole last word.
I might add that, in doing this, I can have phrases that at one time, I'd never have dreamed of putting in! So I may look, but I have it there, and really,
learning to take the time to look at your advisories can actually save you lots and lots of keystrokes, as you catch your continuations and even manual phrases you have put in.
But, I would think a system could be made for that. Even maybe just a z ending for one and an x ending for another. Or x, y, and z if you have three! I'm sure that you would remember which was for which phrase, very soon.
How about it out there, other ideas?