How to draw the following figure using TikZ?

Question

Possible Duplicate:
Aligning trees built with tikzpicture

Is it possible to draw the following figure using TikZ?

It know how to draw simple tree diagrams using TikZ. But this is little bit trickier for me.

Answer 1

Too low-level, maybe:

\documentclass[a5paper]{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[x=1em,y=-2em]

\tikzstyle{every node}=[anchor=mid,inner sep=1pt]

\path (0,0) node{id} ++(1,0) node{*} ++(1,0) node{id};

\begin{scope}[xshift=1.5cm]
\path (0,0) node(F){$F$} ++(1,0) node{*} ++(1,0) node{id};
\path (F) ++ (0,1) node(id){id};
\draw (F) -- (id);
\end{scope}

\begin{scope}[xshift=3cm]
\path (0,0) node(T){$T$} ++(1,0) node{*} ++(1,0) node{id};
\path (T) ++ (0,1) node(F2){$F$} ++ (0,1) node(id2){id};
\draw (T) -- (F2) -- (id2);
\end{scope}

\begin{scope}[xshift=4.5cm]
\path (0,0) node(T2){$T$} ++(1,0) node{*} ++(1,0) node(F3){$F$};
\path (T2) ++ (0,1) node(F4){$F$} ++ (0,1) node(id3){id};
\draw (T2) -- (F4) -- (id3);
\path (F3) ++ (0,1) node(id4){id};
\draw (F3) -- (id4);
\end{scope}

\begin{scope}[xshift=6cm]
\path (1,0) node(T3){$T$} +(-1,1) node(T4){$T$} +(0,1) node(star){*} +(1,1) node(F5){$F$};
\path (T4) ++ (0,1) node(F6){$F$} ++ (0,1) node(id5){id};
\draw (T3) -- (T4) -- (F6) -- (id5);
\path (F5) ++ (0,1) node(id6){id};
\draw (T3) -- (F5) -- (id6);
\draw (T3) -- (star);
\end{scope}

\begin{scope}[xshift=7.5cm]
\path (1,0) node(E){$E$} ++(0,1) node(T5){$T$} +(-1,1) node(T6){$T$} +(0,1) node(star2){*} +(1,1) node(F7){$F$};
\path (T6) ++ (0,1) node(F8){$F$} ++ (0,1) node(id7){id};
\draw (T5) -- (T6) -- (F8) -- (id7);
\path (F7) ++ (0,1) node(id8){id};
\draw (T5) -- (F7) -- (id8);
\draw (E) -- (T5) -- (star2);
\end{scope}

\end{tikzpicture}

\end{document}