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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% version.sty version 2.0
+%
+% Copyright 2009 by Donald Arseneau (asnd@triumf.ca)
+% based on version.sty Copyright 1990 by Stephen Bellantoni,
+% loosely based on "annotation.sty" by Tom Hofmann.
+% 
+% These macros may be freely used, transmitted, reproduced, or modified
+% provided that the copyright notice and this permission is retained.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Version control macros. This package lets you define environments whose 
+% contents will be optionally included in or excluded from the text when 
+% you run LaTeX.
+%
+% Maybe you should be using one of versions.sty, comment.sty, or optional.sty. 
+%
+% Usage:
+%     
+%       \includeversion{NAME}
+% After this declaration, contents of the environment "NAME", that is,
+% text between \begin{NAME} and \end{NAME}, will be processed in the 
+% normal way.  If an environment called NAME is already defined, that
+% definition is retained; if no such environment exists a simple 
+% definition is provided.
+%
+%       \excludeversion{NAME}
+% This indicates that text between \begin{NAME} and \end{NAME} will
+% be totally deleted. Very long sections of excluded text might cause 
+% a `TeX capacity exceeded' error.  Exclusion ends with the first
+% detected \end{NAME}, even if there are additional \begin{NAME} 
+% declarations in the skipped text; that is, nesting of environments
+% is not permitted.  Skipped text may have unbalanced braces, if
+% they would also work in the \includeversion case.
+%
+%       \excludeversion[text]{NAME}
+% This indicates that text between \begin{NAME} and \end{NAME} will
+% be replaced by the specified text.
+%
+% You can define environments for as many versions as you want.
+% A `comment' environment has already been pre-defined with
+% \excludeversion{comment}; you can override this by declaring 
+% \includeversion{comment}.
+%
+% Example:
+%   \includeversion{abridged}\excludeversion{unabridged}
+%   \excludeversion[(redacted)]{redact}
+%   Text for the
+%   \begin{abridged}
+%      short
+%   \end{abridged}
+%   \begin{unabridged}
+%      long and really longwinded, opaque and boring
+%   \end{unabridged}
+%   version of the paper. Punctuation works correctly\begin{unabridged}
+%   because sphack is used\end{unabridged}.
+%   \begin{comment} This is deleted by default. \end{comment}
+%   \begin{redact}This information was withdrawn\end{redact}
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ 
+\ProvidesPackage{version}[2009/09/15 \space v 2.0]
+
+\newcommand\includeversion[1]{%
+  \def\@tempa{\@ifundefined{@Esphack}{\@esphack}{\@Esphack}}%
+  \expandafter\ifx\csname #1\endcsname\@tempa % previously excluded ...
+     \expandafter\let\csname #1\endcsname\@undefined 
+  \fi % ... so do not retain existing definition
+  \@ifundefined{#1}{% Undefined, define a stub
+    \expandafter\gdef\csname #1\endcsname{}%
+    \expandafter\gdef\csname end#1\endcsname{}%
+    \PackageInfo{version}{Including #1 environments declared}
+  }{% % defined, so retain meaning
+    \PackageInfo{version}{Retain meaning of #1 environment declared}%
+  }%
+}%
+%
+\newcommand\excludeversion[2][]{%
+  \expandafter\gdef\csname #2\endcsname{%
+    #1% optional replacement text
+    \@bsphack % avoid double spaces
+    \catcode`\&=12\catcode`\{=12\catcode`\}=12\relax
+    \@Vii@ExcludeToEnd % Do exclusion until \end{\@currenvir}
+  }%
+  \expandafter\gdef\csname end#2\endcsname{%
+      \@ifundefined{@Esphack}{\@esphack}{\@Esphack}}%
+  \PackageInfo{version}{Excluding #2 environments declared}%
+}%
+%
+%  Consume text delimited by the token \end followed by
+%  the current environment name.  Nesting is **NOT** followed
+%
+\long\def\@Vii@ExcludeToEnd#1\end#2{%
+  \def\@tempa{#2}%
+  \ifx\@tempa\@Vii@Brace
+     \let\@tempa\@Vii@ReadEnd
+  \else
+    \ifx\@tempa\@currenvir
+       \def\@tempa{\end{#2}}%
+    \else
+       \def\@tempa{\@Vii@ExcludeToEnd}%
+    \fi
+ \fi
+ \@tempa
+}
+%
+\edef\@Vii@Brace{\string{}%
+%
+\expandafter\def\expandafter\@Vii@ReadEnd\expandafter#\expandafter1\string}{%
+  \@Vii@ExcludeToEnd \end{#1}%
+}
+%
+\excludeversion{comment}
+ 
+\endinput
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% version v. 2 based on version.sty by:
+% Stephen Bellantoni 1990, loosely based on "annotation.sty" by Tom Hofmann.
+%
+% Donald Arseneau produced this version because Stephen Bellantoni had no 
+% permissions explicitly stated in his version.  DA has tried to remain
+% compatible but has indulged in "upgrades" (bloat) which might not be 
+% proper.
+%
+% Although the code is entirely rewritten, there are a few principal 
+% differences with version 2:
+%
+% Verbatim catcoding of braces (to scan over unbalanced braces) is
+% still applied, but is not required to be effective: the \end{NAME}
+% will be detected whether the catcode changes are effective or not.
+%
+% Verbatim catcode for & is set to allow skipping rows of a tabular.
+%
+% Definitions of existing environments are now retained by \includeversion,
+% unless the existing definition is the one made by \excludeversion.
+%
+% Added optional argument for \excludeversion for a textual tag to 
+% replace the excluded content.