\def\next{ex}\ifx\next\miprefix
\mathchardef\Gamma="0180
\mathchardef\Delta="0181
\mathchardef\Theta="0182
\mathchardef\Lambda="0183
\mathchardef\Xi="0184
\mathchardef\Pi="0185
\mathchardef\Sigma="0186
\mathchardef\Upsilon="0187
\mathchardef\Phi="0188
\mathchardef\Psi="0189
\mathchardef\Omega="018A
\fi\let\next\undefined

\iftxxenc
\def\aa{\r a}
\def\AA{\r A}
\def\acute{\mathaccent"7001 }
\def\grave{\mathaccent"7000 }
\def\ddot{\mathaccent"7004 }
\def\tilde{\mathaccent"7003 }
\def\bar{\mathaccent"7009 }
\def\breve{\mathaccent"7008 }
\def\check{\mathaccent"7007 }
\def\hat{\mathaccent"7002 }
\def\dot{\mathaccent"700A }
\fi