<..text symbolsNO..>
\def\AA{{\Protect\Tivht@AA}}
\def\aa{{\Protect\Tivht@aa}}
\def\Tivht@AA{%
\ifx \EndPicture\:UnDef \a:AA\else
\leavevmode\setbox0\hbox{h}\dimen@\ht0\advance\dimen@-1ex%
\rlap{\raise.67\dimen@\hbox{\char’27}}A\fi}
\def\Tivht@aa{%
\ifx \EndPicture\:UnDef \HChar{229}\else \accent23a\fi }
\NewConfigure{AA}{1}
\Configure{AA}{\HChar{197}}
-_-_-
A previous definition \def\aa{{\Protect\:aa}} was problematic because \:aa got into an aux file which got loaded with ‘:’ in catcode 13.
<..text symbolsNO..>+
\def\vdots{\Picture+{ \a:@Picture{vdots}}
\vbox{\baselineskip4\p@ \lineskiplimit\z@
\kern6\p@\hbox{.}\hbox{.}\hbox{.}}\EndPicture}
-_-_-