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6.5 amstex

<..label of amstex.sty..>
 \edef\l:bel#1{\noexpand\@bsphack
    \expandafter\noexpand\csname iffirstchoice@\endcsname
    \expandafter\noexpand\csname if@filesw\endcsname
    \noexpand \L:bll{#1}%
    \expandafter\noexpand\csname if@nobreak\endcsname
    \noexpand\ifvmode\noexpand\nobreak\noexpand\fi
    \expandafter\noexpand\csname fi\endcsname
    \expandafter\noexpand\csname fi\endcsname
    \expandafter\noexpand\csname fi\endcsname
    \noexpand\@esphack}
 \def\L:bll#1{{\let\thepage=\relax
    \def\protect{\noexpand\noexpand\noexpand}%
    \cur:lbl{}\let\Link=\:gobbleII \let\EndLink=\empty \let\ref=\o:ref
    \a:@currentlabel
    \xdef\@gtempa{\write\@auxout{\string
       \newlabel{#1}{{<.logical label.>}{<.page label.>}<.hyperref label.>}}}%
    }\@gtempa}
 \let\l:bel:=\l:bel
 -_-_-

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