% mod1.sty
\renewcommand{\section}
{\@startsection{section}{1}{\z@}
 {-3ex plus -1ex minus-.2ex}{2ex plus.2ex}
 {\centering\normalfont\scshape}}

\renewcommand{\subsection}
{\@startsection{subsection}{2}{\z@}
 {-2ex plus -1ex minus-.2ex}{2ex plus.2ex}
 {\centering\normalfont\itshape}}

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