%%
%% The LaTeX Companion, 3ed
%%
%% Example 8-5-5 on page I-636 in "Basic objects".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{171.0pt}

%StartShownPreambleCommands
\usepackage{tikz}
%StopShownPreambleCommands

\begin{document}
\tikz\draw[dashed] (0,0) -- (1,1)  (1,0) --
    (2,1)  (2,0) -| (3,1)  (4,0) |- (5,1);
\end{document}