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\def\({ \left( }
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\def\e{\end{equation} \color{black}}
%\def\b{\begin{equation}}
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%\def\={\ =\ }
%\def\ap{\ {\guillemotright}\ }
%\def\+{\ +\ }
%\def\-{\ -\ }
%\def\lc{\ell_c}
\def\Ls{\cal L \rm}
\def\ls{\cal l \rm}
%\def\mumu{$\mu^+\mu^-$}
%\def\ee{$e^+e^-$}
\def\bt{\begin{tabular}}
\def\et{\end{tabular}}
\def\bi{\begin{itemize}}
\def\ei{\end{itemize}}
\documentclass{article}
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