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+\documentclass{article}
+\usepackage{tikz}
+\usetikzlibrary{positioning,shapes}
+\begin{document}
+\title{A Letter to the Secretary of the Treasury}
+\author{Mark Twain}
+\date{Riverdale-on-the-Hudson, October 15, 1902}
+\maketitle
+
+\begin{quotation}
+  \em
+  This document consists of three versions:
+  \begin{description}
+  \item[uppercase:] the salutation is in uppercase.
+  \item[nobonds:] the salutation is in uppercase, and the paragraph
+    about government bonds omitted.
+  \item[default:] the salutation is in small caps, and the paragraph
+    about government bonds included.
+  \end{description}
+  There are also updated versions of all three documents, which
+  include the description of the Riverdale.  The update is done in the
+  nobonds version, and then propagated to the other versions of the
+  document.  This is shown on Figure~\ref{fig:flow}.
+
+  This document' version is 
+default.
+
+This document is not updated.
+\end{quotation}
+
+\begin{figure}
+  \centering
+  \begin{tikzpicture}
+    \node[on grid] (twain1) {\color{blue}twain1.tex};     
+    \node[on grid, below= 2cm of twain1] (twain1-nobonds)
+    {\color{red}twain1-nobonds.tex};
+    \node[on grid, left= 3.5cm of twain1-nobonds] (twain1-default)
+    {\color{red}twain1-default.tex}; 
+    \node[on grid, right= 3.5cm of twain1-nobonds] (twain1-uppercase)
+    {\color{red}twain1-uppercase.tex}; 
+    \node[on grid, below= 2cm of twain1-nobonds] (twainedited)
+    {\color{blue}twain-edited.tex}; 
+    \node[on grid, below= 2cm of twainedited] (twain2)
+    {\color{green}twain2.tex}; 
+    \node[on grid, below= 2cm of twain2] (twain2-nobonds)
+    {\color{red}twain2-nobonds.tex};
+    \node[on grid, left= 3.5cm of twain2-nobonds] (twain2-default)
+    {\color{red}twain2-default.tex}; 
+    \node[on grid, right= 3.5cm of twain2-nobonds] (twain2-uppercase)
+    {\color{red}twain2-uppercase.tex}; 
+    \draw[arrows=-latex, color=red] (twain1) -| 
+    node[below=1cm, right] {\scriptsize srcredact -e default}
+    (twain1-default); 
+    \draw[arrows=-latex, color=red] (twain1) -- node[right]
+    {\scriptsize srcredact -e nobonds} (twain1-nobonds);
+    \draw[arrows=-latex, color=red] (twain1) -| 
+    node[below=1cm, right] {\scriptsize srcredact -e uppercase}
+    (twain1-uppercase); 
+    \draw[arrows=-latex, color=blue] (twain1-nobonds) -- node[right]
+    {\scriptsize Manual editing} (twainedited);
+    \draw[arrows=-latex, color=green] (twainedited) -- node[right]
+    (unredact) {\scriptsize srcredact -u nobonds} (twain2);
+    \coordinate[above=of twain1] (above1);
+    \coordinate[right=2 cm of twain1-uppercase] (right-uppercase);
+    \draw[arrows=-latex, color=green, style=dashed] (twain1)
+    -- (above1) -| (right-uppercase) |- (unredact);
+    \draw[arrows=-latex, color=red] (twain2) -| 
+    node[below=1cm, right] {\scriptsize srcredact -e default}
+    (twain2-default); 
+    \draw[arrows=-latex, color=red] (twain2) -- node[right]
+    {\scriptsize srcredact -e nobonds} (twain2-nobonds);
+    \draw[arrows=-latex, color=red] (twain2) -| 
+    node[below=1cm, right] {\scriptsize srcredact -e uppercase}
+    (twain2-uppercase); 
+  \end{tikzpicture}
+  \caption{Document workflow.  \textcolor{blue}{Blue}---manual edits,
+    \textcolor{red}{Red}---generated by srcredact in extract mode,
+    \textcolor{green}{Green}---generated by srcredact in unextract mode.}
+  \label{fig:flow}
+\end{figure}
+
+\textsc{the hon. the secretary of the treasury, washington, d.~c.:}
+
+Sir,---Prices for the customary kinds of winter fuel having reached an
+altitude which puts them out of the reach of literary persons in
+straitened circumstances, I desire to place with you the following order:
+
+Forty-five tons best old dry government bonds, suitable for furnace, gold
+7 per cents., 1864, preferred.
+
+Twelve tons early greenbacks, range size, suitable for cooking.
+
+Eight barrels seasoned 25 and 50 cent postal currency, vintage of 1866,
+eligible for kindlings.
+
+Please deliver with all convenient despatch at my house in Riverdale at
+lowest rates for spot cash, and send bill to
+
+Your obliged servant,
+
+Mark Twain, Who will be very grateful, and will vote right.
+\end{document}