<..equations of amstex.tex..>+
\catcode‘\#=13 \catcode‘\!=6
\def\:tempc!1\endalign{%%
\Mk:ialign:end
{<.amstex.tex align pattern.>}{align}{!1}#%
{<.amstex.tex align env.>}}
\catcode‘\#=6 \catcode‘\!=12
\expandafter\HLet\csname align \endcsname=\:tempc
\expandafter\HLet\csname align \space\endcsname=\:tempc
\NewConfigure{align}{6}
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<..amstex.tex align env..>
\global\and@\z@
\ifingather@\append:def\T:halign{\global\and@\z@}\fi
\Let@\tabskip\centering@
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<..amstex.tex align pattern..>
$\m@th\displaystyle{\@lign#}$\global\advance\and@\@ne
&$\m@th\displaystyle{{}\@lign#}%
$\global\advance\and@\@ne\tabskip\z@skip
&\hbox\bgroup\@lign\maketag@#\maketag@\egroup\tabskip\z@skip
-_-_-