\def\damned_macro_who_was_letter_once#1#2{%\catcode`#1=11\catcode`#2=11
\uccode`#1=`#1\lccode`#1=`#2%
\uccode`#2=`#1\lccode`#2=`#2%
\count0=`#1\advance\count0 by "7000\mathcode`#1=\count0%
\count0=`#2\advance\count0 by "7000\mathcode`#2=\count0%
}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\damned_macro_who_was_letter_once{�}{�}%
\count0=1\def\damned_macro_who_was_letter_once{}%
