If you write
\newcommand{\mchunk}[1]{\chunk{\makebox(30,15){#1}}} \newenvironment{mbundle}[1]{\begin{bundle}{\makebox(30,15){#1}}}{\end{bundle}} \begin{mbundle}{xxx} \mchunk{aaa} \chunk{ \begin{mbundle}{yyy} \mchunk{bbb} \mchunk{ddd} \end{fbundle}} \mchunk{ccc} \end{mbundle}you get
\newcommand{\fchunk}[1]{\chunk{\framebox(30,15){#1}}} \newenvironment{fbundle}[1]{\begin{bundle}{\framebox(30,15){#1}}}{\end{bundle}}
\begin{fbundle}{xxx} \fchunk{aaa} \chunk{ \begin{fbundle}{yyy} \fchunk{bbb} \fchunk{ddd} \end{fbundle}} \fchunk{ccc} \end{fbundle} |
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\begin{fbundle}{xxx} \fchunk{aaa} \chunk{\fbox{ \begin{fbundle}{yyy} \fchunk{bbb} \fchunk{ddd} \end{fbundle}}} \fchunk{ccc} \end{fbundle} |
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