5.10 plain latex

<..32 plain,latex..>+
 \def\:zbsp#1{cellpadding="0" border="0" cellspacing="0"\Hnewline}
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<..pic plain/latex math 3.2NO..>
 \Configure{big}{\HCode{<big>}}{\HCode{</big>}}
 \Configure{Big}{\HCode{<big><big>}}{\HCode{</big></big>}}
 \Configure{bigg}{\HCode{<big><big><big>}}
    {\HCode{</big></big></big>}}
 \Configure{Bigg}{\HCode{<big><big><big><big>}}
    {\HCode{</big></big></big></big>}}
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<..pic plain math 3.2..>
 \Contribute{underbrace}{align="middle"}
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<..pic plain/latex math 3.2..>
 \Configure{underline}
   {\Tg<u>}{\Tg</u>}
 \newbox\tmp:bx
 \Configure{overline}{\Picture+{
    \a:@Picture{overline}}\setbox\tmp:bx=\hbox
        \bgroup\everypar{}}{\egroup\o:overline:{\box\tmp:bx}\EndPicture}
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<..pic plain/latex math 3.2..>+
 \NewConfigure{@root}{1}
 \Configure{@root}{align="middle" }
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