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%%
%% This is an example drawing that uses the TikZ package for LaTeX.  You can
%% ignore the \documentclass line, and use \documentclass{article} or whatever
%% you usually use.  You need \usepackage{tikz}; the picture is contained
%% in the tikzpicture environment.
%%

\documentclass[tikz,convert={outfile=\jobname.svg}]{standalone}

\begin{document}

\begin{tikzpicture}[grow=right]
\tikzstyle{level 1}=[level distance=5em, sibling distance=5em]
\tikzstyle{level 2}=[level distance=5em, sibling distance=2em]
\node[grow=right,sloped]{}
  child { node {$\bar{R}$}
    child { node {$\bar{R} \cap \bar{U}$} edge from parent node[below] {.90}}
    child { node {$\bar{R} \cap U$} edge from parent node[above] {.10}}
    edge from parent node[below] {.70}
  }
  child { node {$R$}
    child { node {$R \cap \bar{U}$} edge from parent node[below] {.25}}
    child { node {$R \cap U$} edge from parent node[above] {.75}}
    edge from parent node[above] {.30}
  }
;
\end{tikzpicture}

\end{document}


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