pffff... finally...
I gave up trying it by hand and wrote a script to try 1800 different variations on capitalization, and spelling out of acronyms, and inclusion of whitespace in within names when the acronyms were spelled out, etc...
It turns out my stumbling block was the last one. Keeping the same format as above, I was typing in X rather than yX.
Honestly, I think that's wrong. yX got a new logo. Even if they hadn't though, I'd still say that X would be more correct, and if you accept yX, then you certainly would have to accept X as well... but that's neither here nor there since yX has a new logo now anyway...