bundle environment

A tree is drawn by bundle environment. The bundle environment has one argument, which specifies the top node label. This environment is a picture environment with \unitlength=1pt. Leaves should be specified by \chunk in this environment.

If you write

\begin{bundle}{xxx}
\chunk{aaa}
\chunk{bbb}
\chunk{ccc}
\end{bundle}
you get
\begin{bundle}{xxx}
\chunk{aaa}
\chunk{bbb}
\chunk{ccc}
\end{bundle}
.

You can nest the bundle environment.

\begin{bundle}{xxx}
\chunk{aaa}
\chunk{
        \begin{bundle}{yyy}
        \chunk{bbb}
        \chunk{ddd}
        \end{bundle}}
\chunk{ccc}
\end{bundle}

\begin{bundle}{xxx}
\chunk{aaa}
\chunk{
\begin{bundle}{yyy}
\chunk{bbb}
\chunk{ddd}
\end{bundle}}
\chunk{ccc}
\end{bundle}