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\ProvidesPackage{mathtools}
%% Very partial implementation.
%% Brackets
\DeclareSymbolHtml{\hva@tlhb}{X2E22}
\DeclareSymbolHtml{\hva@trhb}{X2E23}
\newcommand{\textoverbracket}[1]
{\hva@warn{\overbracket in non-display mode}#1}
\newcommand{\@overbracket}[1]
{\mathop{\@over@arrow[3]
{\d@cell[style="width:5\%"]{\hva@tlhb}%
\d@cell[style="width:90\%;"]{\@hbar[style="margin-top:0;"]}%
\d@cell[style="width:5\%"]{\hva@trhb}}
{#1}}}
\newcommand{\overbracket}{\DisplayChoose\@overbracket\textoverbracket}
\DeclareSymbolHtml{\hva@blhb}{X2E24}
\DeclareSymbolHtml{\hva@brhb}{X2E25}
\newcommand{\textunderbracket}[1]
{\hva@warn{\underbracket in non-display mode}#1}
\newcommand{\@underbracket}[1]
{\mathop{\@under@arrow[3]
{\d@cell[style="width:5\%"]{\hva@blhb}%
\d@cell[style="width:90\%"]{\@hbar[style="margin-bottom:0;margin-top:2ex;"]}%
\d@cell[style="width:5\%"]{\hva@brhb}}
{#1}}}
\newcommand{\underbracket}{\DisplayChoose\@underbracket\textunderbracket}
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