%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-3-24 on page I-350 in "paracol --- Several text streams aligned".
%%
%% 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\parindent{0pt}
  \addtolength\textwidth{-10pt}

%StartShownPreambleCommands
\usepackage{lineno,paracol} \linenumbers
%StopShownPreambleCommands

\begin{document}
\globalcounter{linenumber}
\begin{paracol}{3}  \raggedright
        Left                 \switchcolumn
        Middle \\ Middle     \switchcolumn
 \tiny  Right  \\ Right      \switchcolumn
 \Large Left again and again \switchcolumn
   Middle
\end{paracol}
\end{document}