Megnéztem, de abban a file-ban csak ezt leltem (csúnyán néz ki ide másolva):
\@ifclassloaded{article}{%
\expandafter\addto\csname extras\CurrentOption\endcsname{%
\babel@save\ps@headings}
\expandafter\addto\csname extras\CurrentOption\endcsname{%
\if@twoside
\def\ps@headings{%
\let\@oddfoot\@empty\let\@evenfoot\@empty
\def\@evenhead{\thepage\hfil\slshape\leftmark}%
\def\@oddhead{{\slshape\rightmark}\hfil\thepage}%
\let\@mkboth\markboth
\def\sectionmark##1{%
\markboth {\MakeUppercase{%
\ifnum \c@secnumdepth >\z@
\thesection.\quad
\fi
##1}}{}}%
\def\subsectionmark##1{%
\markright {%
\ifnum \c@secnumdepth >\@ne
\thesubsection.\quad
\fi
##1}}}%
\else
\def\ps@headings{%
\let\@oddfoot\@empty
\def\@oddhead{{\slshape\rightmark}\hfil\thepage}%
\let\@mkboth\markboth
\def\sectionmark##1{%
\markright {\MakeUppercase{%
\ifnum \c@secnumdepth >\m@ne
\thesection.\quad
\fi
##1}}}}%
\fi}%
}{}
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