1 \ififthen\endinput\fi 2 \@stopimage 3 \@primitives{ifthen} 4 \newcommand{\@iffileexists}[3]{\ifthenelse{\@fileexists{#1}}{#2}{#3}} 5 \newcommand{\@ifundefined}[3] 6 {\ifthenelse{\@commandexists\csname #1\endcsname}{#3}{#2}} 7 \ifthentrue 8 \@restartimage