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\ProvidesPackage{autopagewidth}
%This is a package which attempts to set the text width according to the
%font size. I'm not sure this is a good idea, and I'm not sure if this
%a good implementation of this idea. But you are free to play with this
%package as you like. Comments are welcomed.
\PackageWarningNoLine{AutoPageWidth}{This is an experimental style^^J
It is provided for evaluation only.}
\def\APW@text{\normalfont A rule of thumb is that no line should contain
more than 70 characters} %this is a text containing 70 char's
%In cmr10 it is 311pt long. Which compares to a default textwith of 345pt
%Thus the effect of this package is to widen the margins still further
%(to the chagrin of the MSword crowd no doubt)
\setlength\@tempdima{\paperwidth}
\addtolength\@tempdima{-2in}
\settowidth\@tempdimb{\APW@text}
\if@twocolumn
\ifdim\@tempdima>2\@tempdimb\relax
\setlength\textwidth{2\@tempdimb}
\else
\setlength\textwidth{\@tempdima}
\fi
\else
\ifdim\@tempdima>\@tempdimb\relax
\setlength\textwidth{\@tempdimb}
\else
\setlength\textwidth{\@tempdima}
\fi
\fi
\@settopoint\textwidth
\if@twoside
\setlength\@tempdima {\paperwidth}
\addtolength\@tempdima {-\textwidth}
\setlength\oddsidemargin {.4\@tempdima}
\addtolength\oddsidemargin {-1in}
\setlength\marginparwidth {.6\@tempdima}
\addtolength\marginparwidth {-\marginparsep}
\addtolength\marginparwidth {-0.4in}
\else
\setlength\@tempdima {\paperwidth}
\addtolength\@tempdima {-\textwidth}
\setlength\oddsidemargin {.5\@tempdima}
\addtolength\oddsidemargin {-1in}
\setlength\marginparwidth {.5\@tempdima}
\addtolength\marginparwidth {-\marginparsep}
\addtolength\marginparwidth {-0.4in}
\addtolength\marginparwidth {-.4in}
\fi
\ifdim \marginparwidth >2in
\setlength\marginparwidth{2in}
\fi
\@settopoint\oddsidemargin
\@settopoint\marginparwidth
\setlength\evensidemargin {\paperwidth}
\addtolength\evensidemargin{-2in}
\addtolength\evensidemargin{-\textwidth}
\addtolength\evensidemargin{-\oddsidemargin}
\@settopoint\evensidemargin
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