%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-27 on page I-195 in "microtype \& soul --- Letterspacing or stealing sheep".
%%
%% 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{135.0pt}
\renewcommand\rmdefault{cmr}
\setlength\parindent{0pt}

%StartShownPreambleCommands
\usepackage{soulutf8}
\soulaccent{\capitalgrave}
%StopShownPreambleCommands

\begin{document}
\Huge \st{\"a \`u \~O \capitalgrave X {\capitalbreve Y}}

% next line needs soulutf8:
      \st{ä   ù   Õ   \capitalgrave X {\capitalbreve Y}}
\end{document}