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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%
}
%% larger skip
\newskip\hugeskipamount
\hugeskipamount=24pt plus8pt minus8pt
\def\hugeskip{\vskip\hugeskipamount}
%% penalty before large blocks
\def\preblock{
\penalty-500
}
%% listparpenalty prevents page breaks before lists
\newcount\prevparpenalty
\def\listparpenalty{
\prevparpenalty=\@beginparpenalty
\@beginparpenalty=10000
}
%% back to previous value
\def\unlistparpenalty{
\@beginparpenalty=\prevparpenalty
}
%% stack relations in subscript or superscript
\def\mAthop#1{\displaystyle\mathop{\scriptstyle #1}}
%% array spanning the entire line
\newlength\largearray@width
\setlength\largearray@width\textwidth
\addtolength\largearray@width{-10pt}
\def\largearray{\begin{array}{@{}>{\displaystyle}l@{}}\hphantom{\hspace{\largearray@width}}\\[-.5cm]}
\def\endlargearray{\end{array}}
%% qedsquare
\def\qed{\penalty10000\hfill\penalty10000$\square$}
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