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\catcode`\@=11
\def\R#1{%
  \ifx#1\undefined\else
  \immediate\write16{\meaning#1: \the#1\space}%
  \fi}
\def\S#1{%
  \ifx#1\undefined\else
  \immediate\write16{\meaning#1: "#1"\space}%
  \fi}

\ifx\eTeXversion\undefined\else
  \R\eTeXversion
  \S\eTeXrevision
\fi

\ifx\ptexversion\undefined\else
  \R\ptexversion
  \R\ptexminorversion
  \S\ptexrevision
  \R\epTeXversion
  \R\uptexversion
  \S\uptexrevision
\fi

\ifx\Omegaversion\undefined\else
  \R\Omegaversion
  \R\Omegaminorversion
  \S\Omegarevision
  \R\Alephversion
  \R\Alephminorversion
  \S\Alephrevision
\fi

\ifx\pdftexversion\undefined\else
  \R\pdftexversion
  \S\pdftexrevision
\fi
\ifx\luatexversion\undefined\else
  \R\luatexversion
  \S\luatexrevision
\fi

\end