%%
%% The LaTeX Companion, 3ed
%%
%% Example 5-4-1 on page I-398 in "fancyhdr --- Customizing page styles".
%%
%% 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{183.0pt}
\setlength\textheight{6\baselineskip}
\addtolength\headsep{-12pt}  % shortened for the book
\addtolength\footskip{-12pt} % shortened for the book

%StartShownPreambleCommands
\usepackage{kantlipsum}
\usepackage{fancyhdr} \pagestyle{fancy}
\lhead{Left} \chead{CENTER} \rhead{Right}
\lfoot{some-very-very-very-long-left} \cfoot{}
\rfoot{some-very-long-right}
\renewcommand\headrulewidth{2pt}
\renewcommand\footrulewidth{0.4pt}
%StopShownPreambleCommands

\begin{document}
\kant[5][1-2]
\end{document}