

%%% outline
%-------------------------------------------------------------------------
\begin{tikzpicture}
    \begin{scope}
    {
    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
    \node [anchor=west,inner sep=2pt] (s2) at ([xshift=0.4em]s1.east) {你};
    \node [anchor=north,inner sep=2pt] (t1) at ([yshift=-1.4em]s1.center) {thank};
    \node [anchor=north,inner sep=2pt] (t2) at ([yshift=-1.6em]s2.center) {you};
    \node [anchor=east,inner sep=2pt] (t0) at ([xshift=-0.2em,yshift=-0.05em]t1.west) {$t_0$};
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    \draw [-] (s2.south) -- (t0.north);
   {
    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
    \node [anchor=south west,inner sep=0pt] (p2) at ([yshift=0.2em]t2.north east) {\small{{\color{ugreen} )}}};
    \node [anchor=west] (eq) at ([xshift=0.7em]p2.east) {\small{+}};
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    \end{scope}
    \begin{scope}[xshift=1.5in]
    {
    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
    \node [anchor=west,inner sep=2pt] (s2) at ([xshift=0.4em]s1.east) {你};
    \node [anchor=north,inner sep=2pt] (t1) at ([yshift=-1.4em]s1.center) {thank};
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    {
    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \begin{scope}[xshift=3in]
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    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \begin{scope}[yshift=-0.6in]
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \begin{scope}[xshift=1.5in,yshift=-0.6in]
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    {
    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \begin{scope}[yshift=-1.2in]
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    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
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    \draw [-] (s2.south) -- (t0.north);
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \begin{scope}[xshift=1.5in,yshift=-1.2in]
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    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    }
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    \begin{scope}[xshift=3in,yshift=-1.2in]
    {
    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {谢谢};
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    \node [anchor=south east,inner sep=0pt] (p) at (t0.north west) {\small{{\color{ugreen} P\;(}}};
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    \node [anchor=west] (eq) at ([xshift=0.7em]p2.east) {\normalsize{= \ P\,($\mathbf{s}|\mathbf{t}$)}};
    }
    }
    \end{scope}
    \end{tikzpicture}

%---------------------------------------------------------------------

