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-% chngpage.sty
-%
-% Provides commands to change the page layout in the middle of a document,
-% and to robustly check for typesetting on odd or even pages.
-% Instructions for use are at the end of this file.
-%
-% Author: Peter Wilson (CUA) now at peter.r.wilson@boeing.com
-%                            (or pandgwilson@earthlink.net) 
-% Copyright 2000, 2001, 2003 Peter R. Wilson
-%
-% This work may be distributed and/or modified under the
-% conditions of the LaTeX Project Public License, either
-% version 1.3 of this license or (at your option) any 
-% later version.
-% The latest version of the license is in
-%    http://www.latex-project.org/lppl.txt
-% and version 1.3 or later is part of all distributions of
-% LaTeX version 2003/06/01 or later.
-%
-% This work has the LPPL maintenance status "author-maintained".
-%
-% This work consists of this file.
-%
-%
-%
-\NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{chngpage}[2003/08/10 v1.2 change page layout]
-
-%% Note: internal package commands all include the string `cp@'
-%% new \if for the strict option
-\newif\ifcpstrict
-  \cpstrictfalse
-
-%% Declare and process options
-\DeclareOption{strict}{\cpstricttrue}
-\ProcessOptions\relax
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%% new commands for strict checking of odd/even page
-%% Works by writing a label and then checking its pageref
-%%
-% rewritten in v1.2 to handle roman, Roman, etc page numbers
-% as well as arabic; also eliminates special code to handle
-% hyperref. Based on the code in the memoir class.
-
-\newif\ifcpoddpage
-\newcounter{cp@cnt}
-\newcounter{cp@tempcnt}
-\newcommand{\cplabelprefix}{^_}
-
-\gdef\thecp@page{\the\c@page}
-\long\def\cp@protected@write#1#2#3{%  % modified \protected@write
-  \begingroup
-  \let\thecp@page\relax
-  #2%
-  \let\protect\@unexpandable@protect
-  \edef\reserved@a{\write#1{#3}}%
-  \reserved@a
-  \endgroup
-  \if@nobreak\ifvmode\nobreak\fi\fi}
-
-\DeclareRobustCommand{\checkoddpage}{%
-  \cpoddpagefalse
-  \stepcounter{cp@cnt}\cplabel{\cplabelprefix\thecp@cnt}%
-  \c@cp@tempcnt=\cp@labelref{\cplabelprefix\thecp@cnt}\relax
-  \ifodd\c@cp@tempcnt\cpoddpagetrue\fi}
-
-\newcommand{\cplabel}[1]{\@bsphack
-  \cp@protected@write\@auxout{}%
-    {\string\newcplabel{#1}{\thecp@page}}%
-  \@esphack}
-
-\newcommand{\newcplabel}[2]{{\global\@namedef{p@#1}{#2}}}
-
-\newcommand{\cp@labelref}[1]{%
-  \expandafter\ifx\csname p@#1\endcsname\relax
-    0%  % 0 if there is no label yet in aux file
-  \else
-    \csname p@#1\endcsname
-  \fi}
-
-%% end newcommands for strict checking of odd/even page
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-%% copy of some of the code from the ifmtarg package to save requiring ifmtarg
-\begingroup
-\catcode`\Q=3
-\long\gdef\@ifmtarg#1{\@xifmtarg#1QQ\@secondoftwo\@firstoftwo\@nil}
-\long\gdef\@xifmtarg#1#2Q#3#4#5\@nil{#4}
-\endgroup
-
-%% set the page output parameters
-%\newcommand{\ch@ngetext}{%
-\DeclareRobustCommand{\ch@ngetext}{%
-  \setlength{\@colht}{\textheight}\setlength{\@colroom}{\textheight}%
-  \setlength{\vsize}{\textheight}\setlength{\columnwidth}{\textwidth}%
-  \if@twocolumn%
-    \advance\columnwidth-\columnsep \divide\columnwidth\tw@%
-    \@firstcolumntrue%
-  \fi%
-  \setlength{\hsize}{\columnwidth}%
-  \setlength{\linewidth}{\hsize}%
-}
-
-%\newcommand{\changetext}[5]{%
-\DeclareRobustCommand{\changetext}[5]{%
-  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
-  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
-  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
-  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
-  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
-  \ch@ngetext%
-}
-
-%\newcommand{\changepage}[9]{%
-\DeclareRobustCommand{\changepage}[9]{%
-  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
-  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
-  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
-  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
-  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
-  \ch@ngetext%
-  \@ifmtarg{#6}{}{\addtolength{\topmargin}{#6}}%
-  \@ifmtarg{#7}{}{\addtolength{\headheight}{#7}}%
-  \@ifmtarg{#8}{}{\addtolength{\headsep}{#8}}%
-  \@ifmtarg{#9}{}{\addtolength{\footskip}{#9}}%
-}
-
-
-\newenvironment{adjustwidth}[3][\@empty]{%
-  \begin{list}{}{%
-    \topsep\z@%
-    \listparindent\parindent%
-    \parsep\parskip%
-    \@ifmtarg{#2}{\setlength{\leftmargin}{\z@}}{\setlength{\leftmargin}{#2}}%
-    \@ifmtarg{#3}{\setlength{\rightmargin}{\z@}}{\setlength{\rightmargin}{#3}}%
-    \ifx\@empty #1\relax \else
-      \cpoddpagefalse
-      \ifcpstrict\checkoddpage\else
-        \ifodd\c@page\cpoddpagetrue\fi
-      \fi
-      \ifcpoddpage\else  % even numbered page
-        \@ifmtarg{#3}{\setlength{\leftmargin}{\z@}}{\setlength{\leftmargin}{#3}}%
-        \@ifmtarg{#2}{\setlength{\rightmargin}{\z@}}{\setlength{\rightmargin}{#2}}%
-      \fi
-    \fi}
-    \item[]}{\end{list}}
-
-
-
-\endinput
-
-% Usage:
-% ------
-%
-%%%%%%%%%%%%%
-% \changetext
-%%%%%%%%%%%%%
-%     The \changetext command is for changing the size and horizontal position
-% of the text block on a page. The command takes 5 arguments, each of which 
-% is a length or is empty. i.e.,
-%
-% \changetext{textheight}{textwidth}{evensidemargin}{oddsidemargin}{columnsep}
-%
-% The given lengths are added to the corresponding current lengths and
-% the remainder of the current page is typeset using the changed text block 
-% layout. The new layout remains in effect until another \change... command 
-% is issued.
-%
-%%%%%%%%%%%%%
-% \changepage
-%%%%%%%%%%%%%
-%     The \changepage command is for changing the general layout of
-% a page. The command takes 9 arguments, each of which is a length or is empty. 
-% The first 5 arguments are the same as for \changetext and have the same effect.
-% The last four arguments are:
-%
-% \changepage{5 args}{topmargin}{headheight}{headsep}{footskip}
-%
-% These lengths are added to the corresponding current lengths and
-% thus modify the vertical positions of the elements of the page. The
-% remainder of the current page is typeset using the changed text block 
-% and page layout. The new layout remains in effect until another 
-% \change... command is issued.
-%
-% NOTE 1: Not supplying a value for a length argument is equivalent
-%         to giving it a zero length value.
-%
-% NOTE 2: For any given page, everything is constant except for the textwidth
-%         and columnsep (for example, what is the meaning of two
-%         topmargins on a single column page?).
-%         It is therefore best to change anything else at the
-%         start of a new page. Further, any changes only apply to whole
-%         paragraphs. If you want an odd shaped paragraph use either
-%         the hanging package or the TeX \parshape command.
-%
-%     For example, to change from single column pages to double column
-% pages where the text block is both shorter and wider, then to revert
-% back to the initial layout:
-% ... single column normal page
-% \newpage % or \clearpage
-% \changetext{-5\baselineskip}{10em}{-5em}{-5em}{}
-% \twocolumn
-% ... two column pages
-% \clearpage 
-% \changetext{5\baselineskip}{-10em}{5em}{5em}{}
-% \onecolumn
-% ... normal pages
-%
-% Note the adjustments to the margins which will keep the vertical centerline
-% of the textblock at the same position on the page.
-%
-%    As another example, to increase the width of a single paragraph:
-%
-% \changetext{0pt}{5em}{}{}{}%
-% Start of wider paragraph text ...
-% ... end of paragraph.
-%
-% \changetext{0pt}{-5em}{}{}{}
-% Start of a normal paragraph ...
-%
-%     Under some circumstances you can include a \change... command as part of
-% the argument to \afterpage (from the afterpage package) and it may work.
-% Similarly it may work in a heading style used for \thispagestyle to change
-% a single page.
-%
-%%%%%%%%%%%%%
-% adjustwidth
-%%%%%%%%%%%%%
-%    Within an adjustwidth environment the left and right margins can be
-% adjusted. The environment takes one optional argument and two required
-% length arguments: 
-%
-% \begin{adjustwidth}[]{leftmargin}{rightmargin}
-%
-%     A positive length value will increase the relevant margin (shortening
-% the text lines) while a negative length value will decrease the margin
-% (lengthening text lines). An empty length argument means no change
-% to the margin. At the end of the environment the margins revert to
-% their original values.
-%
-%    For example, to extend the text into the right margin:
-% \begin{adjustwidth}{}{-8em}
-%
-%    Any appearance of the optional argument (even just []) will cause
-% the values of the margins to switch between odd and even pages.
-%
-%    If the document is being set twosided it might be advantageous
-% to have any wider text extending into the outside margin. This
-% could be done via the optional argument, as:
-% \begin{adjustwidth}[]{}{-8em}
-%
-%    To have the adjusted text horizontally centered with respect to
-% any surrounding text, the margins should be adjusted equally:
-% \begin{adjustwidth}{-4em}{-4em}
-%
-%    For interest, \begin{quotation} is pretty much equivalent
-% to \begin{adjustwidth}{2.5em}{2.5em}
-%
-%    The environment may also be used inside a float if the contents are
-% a bit too wide for the text block, but can still fit within the physical
-% page:
-% \begin{figure}
-%   \begin{adjustwidth}{-2em}{-2em}
-%      \includegraphics{wide}
-%      \caption{Wide figure}
-%   \end{adjustwidth}
-% \end{figure}
-%
-%   Sometimes, because of the asynchronous nature of the TeX output
-% routine, the margin switching may be incorrect (like \marginpar sometimes)
-% near the top of a page. This can be corrected by using the package
-% option `strict' (i.e., \usepackage[strict]{chngpage}), which causes
-% adjustwidth to use the \checkoddpage command (see below).
-%
-%   A disadvantage of the strict option is that the package generates
-% a new label for each adjustwidth environment, and TeX may run out
-% of space if there are an excessive number of labels in the document.
-%
-%   Whether or not the strict option is used, `strict adjustwidths'
-% can be turned on by putting the command \cpstricttrue before
-% the environment, and turned of by using \cpstrictfalse.
-%
-%     NOTE: In a twocolumn document, the adjustwidth environment 
-% treats both columns equally. For example, if the width is meant
-% to be wider at the outer margin, then on odd pages the extra width
-% will be at the right of any column, and on even pages the extra
-% will be at the left of any column. You can get interesting effects
-% by careful hand tuning on two column pages.
-%
-%%%%%%%%%%%%%%%
-% \checkoddpage
-%%%%%%%%%%%%%%%
-%    The \checkoddpage command can be used anywhere in the body of
-% a document to determine if TeX is typesetting on an odd or
-% even numbered page. If on an odd page then \ifcpoddpage is
-% set TRUE, otherwise (on an even page) \ifcpoddpage is set
-% FALSE.
-%
-%    This works by the \checkoddpage command generating a label and
-% then checking the \pageref for the label (actually, a special version
-% of \pageref is required and is used internally by \checkoddpage). 
-% This mechanism requires at least two LaTeX passes to ensure that 
-% the labels have settled (on the initial pass there will be no labels
-% in the *.aux file to be checked).
-%
-%   The label identifier is composed of the command \cplabelprefix
-% and an automatically generated number. \cplabelprefix, initially
-% defined as `^_', can be changed in the preamble if it will cause
-% a clash with any author-defined labels. The default labels will
-% be of the form `^_N' where N is a positive integer.
-% 
-% Changes in version 1.2 (2003/08/10)
-% ----------------------
-% o Fixed \checkoddpage to handle page numbers other than arabic
-% o Eliminated special \checkoddpage code for hyperref
-%
-% Changes in version 1.1c (2001/02/24)
-% -----------------------
-% o Fixed problem when used with the calc package
-%   (can't do \setcounter{cp@tempcnt}{\cp@pageref{....}}
-% o Fixed problem when used with the hyperef package
-%   (hyperref adds new arguments to \newlabel in the *.aux file)
-%
-% Changes in version 1.1b (2001/01/31)
-% -----------------------
-% o Added strict option for robust adjustwidth; checks odd/even
-%   pages via labels instead of by the page counter.
-% 
-% Changes in version 1.1a (2001/01/18)
-% -----------------------
-% o Added missing {} in last 4 arguments of \changepage
-% 
-% Changes in version 1.1 (2000/07/22)
-% ----------------------
-% o Empty arguments made available
-% o Added adjustwidth environment
-% 
-% 
-% Peter W.
-%
-%