%%
%% The LaTeX Companion, 3ed
%%
%% Example 8-5-24 on page I-644 in "Transformations and other operations".
%%
%% 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[T1]{fontenc}  \usepackage{tikz}
%StopShownPreambleCommands

\begin{document}
\foreach \x/\y/\z in {apple/red/ok?} { ı ȷ Ą } (fine)      \par
\foreach \i/\j/\k in {apple/red/ok?} { ı ȷ Ą } (surprise!)
\end{document}