tex_dtx	code	\begin{document}
tex_dtx	code	\texbf Hello world
tex_dtx	blank	
tex_dtx	blank	
tex_dtx	code	% \acommand
tex_dtx	code	% \anothercommand
tex_dtx	comment	%% sample comment
tex_dtx	blank	
tex_dtx	code	\end{document}
