%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-5-39 on page I-230 in "enotez --- Endnotes, an alternative to footnotes".
%%
%% 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{159.0pt}

\setlength\parindent{0pt}

% for the book examples we shorten the vertical spaces
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
                                    {-1.25ex \@plus-1ex \@minus-.2ex}%
                                    {.5ex}%
                                    {\normalfont\large\bfseries}}
\makeatother

%StartShownPreambleCommands
\usepackage{enotez}
%StopShownPreambleCommands

\begin{document}
This is text.\endnote{The first\endnote{A nested
    note\ldots\endnote{\ldots which itself
      contains a note.}} endnote.\endnote{Another
    second-level note with more text to show its
    formatting in the note section.}}
And this is more text.\endnote{The third
  endnote.\endnote{Also with a second-level note.}}

\printendnotes[itemize]
\end{document}