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+%% 
+%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
+%% 
+%%  Example 8-6-4 on page 579.
+%% 
+%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
+%% 
+%%  It 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.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{427.6677pt}
+
+\StartShownPreambleCommands
+\usepackage[ic]{circ}
+\usepackage{array}
+\StopShownPreambleCommands
+\begin{document}
+\providecommand{\Lcs}[1]{\mbox{\normalfont\ttfamily\char'134#1}}
+\setlength{\extrarowheight}{3mm}
+\def\Ccirc#1 #2 #3{\def\Clpin##1{\relax}\def\Crpin##1{\relax}%
+   \raisebox{\depth}%
+   {\begin{circuit}0 \csname #1\endcsname n {\,} #2 {} #3
+   \end{circuit}}}
+\begin{tabular}{@{}cccccc@{}}
+\Ccirc NRSFF S {\Clpin{S}\Clpin{R}\Crpin{Q}\Crpin{NQ}}
+&
+\Ccirc DFF C {\Clpin{C}\Clpin{D}\Crpin{Q}\Crpin{NQ}}
+&
+\Ccirc JKMSFF R {\Clpin{S}\Clpin{J}\Clpin{C}\Clpin{K}\Clpin{R}\Crpin{Q}\Crpin{NQ}}
+&
+\Ccirc fff R {\Clpin{IS}\Clpin{IT}\Clpin{R}\Crpin{OK}\Crpin{O}\Crpin{OD}}
+&\Ccirc NULL i+ {\Clpin{i+}\Clpin{i-}\Crpin{o+}\Crpin{o-}}
+\\
+\Lcs{NRSFF} & \Lcs{DFF} & \Lcs{JKMSFF} & \Lcs{fff} & \Lcs{NULL} \\
+RS flip-flop & D flip-flop & JK master slave flip-flop & timer & nuller
+\end{tabular}
+\end{document}