%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-4-32 on page II-177 in "amsmath, accents, mathdots --- Various accents".
%%
%% 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{111.0pt}

%StartShownPreambleCommands
\usepackage{amsmath,mathdots}
%StopShownPreambleCommands

\begin{document}
$ \dot{S} \quad \ddot{P} \quad \dddot{Q} \quad \ddddot{R} $
\end{document}