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%%
%% A collection of useful commands
%%
%% can call commands even when they are not defined
\def\safe#1{%
\ifdefined#1%
#1%
\else%
{\color{red}\bf?}%
\fi%
}
%% add infinitely extendable glue before large blocks (e.g. figures)
\def\preblock{
\vfil
\hbox{}
}
%% listparpenalty prevents page breaks before lists
\newcount\prevparpenalty
\def\listparpenalty{
\prevparpenalty=\@beginparpenalty
\@beginparpenalty=10000
}
%% back to previous value
\def\unlistparpenalty{
\@beginparpenalty=\prevparpenalty
}
%% array spanning the entire line
\def\largearray{\begin{array}{@{}>{\displaystyle}l@{}}\hphantom{\hspace{\textwidth}}\\[-.5cm]}
\def\endlargearray{\end{array}}
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