AT, TAT, MAT?

Just a clarification for those that might be mis-interpreting some of
my comments: I'm not dismissing information or ignoring it or having
it go "over my head"... I just never stop asking questions or digging
for deeper understanding - sometimes in new directions, sometimes by
trying to refine previous answers or by trying to define special cases
or exceptions to general rules. :-)

Thanks for the continuing good info,

--Noel