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\documentclass{article}
\usepackage{l3expan,l3io}
\begin{document}
\CodeStart
\def_new:Npn\test_cmd:nn#1#2{
\iow_unexpanded_term:n{}
\iow_unexpanded_term:n{Argument~1:~#1}
\iow_unexpanded_term:n{Argument~2:~#2}}
\def:Npn\a{A}
\def:Npn\b{B}
\def:Npn\aa{\a}
\def:Npn\bb{\b}
\exp_def_form:nnn {test_cmd}{nn}{oo}
\exp_def_form:nnn {test_cmd}{nn}{xx}
\exp_def_form:nnn {test_cmd}{nn}{cc}
\exp_def_form:nnn {test_cmd}{nn}{nx}
\test_cmd:nn{a}{b}
\test_cmd:nn{\a}{\b}
\test_cmd:oo\aa\bb
\test_cmd:xx\aa\bb
\test_cmd:cc{a}{b}
\test_cmd:nx{a}{\b}
\CodeStop
\LaTeX\ still works!
\end{document}
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