%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-10 on page I-263 in "enumitem --- Extended list environments".
%%
%% 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}

%StartShownPreambleCommands
\usepackage{enumitem}
\newlist{steps}{enumerate}{4}
%StopShownPreambleCommands

\begin{document}
\noindent An example of a new list is \texttt{steps}:
\begin{steps}[label=\arabic*:]
\item Lists are declared with \verb=\newlist=.
\item But this is not enough:
  \begin{steps}[label=\alph*)]
  \item as a minimum we need to define a \texttt{label}.
  \item this is done here locally on each environment.
  \end{steps}
\item Usually, \verb=\setlist= is used for this.
\end{steps}
\end{document}