\def\Orb{\mathhexbox20D}
\input plainenc\relax
\fontencoding{T1}
\inputencoding{latin1}\let\:=\relax
\catcode`\@=11
\ifx\@ifnextchar\@undefined\def\@ifnextchar#1#2#3{%
  \let\reserved@d=#1\def\reserved at a{#2}
  \def\reserved@b{#3}\futurelet\@let@token\@ifnch}
  \def\@ifnch{\ifx
                 \@let@token\@sptoken\let\reserved@c\@xifnch
              \else
                 \ifx\@let@token\reserved@d\let\reserved@c\reserved@a
                 \else
                    \let\reserved@c\reserved@b
                 \fi
              \fi
  \reserved@c}\def\;{\let\@sptoken= }\;
  \def\;{\@xifnch}\expandafter\def\;{\futurelet\@let@token\@ifnch}
\fi
\catcode`\@=12
\endinput
