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%%% outline
%-------------------------------------------------------------------------
\begin{tikzpicture}

    {
    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {$s_1$:在};
    \node [anchor=west,inner sep=2pt] (s2) at ([xshift=2em]s1.east) {$s_2$:桌子};
    \node [anchor=west,inner sep=2pt] (s3) at ([xshift=2em]s2.east) {$s_3$:上};

    \node [anchor=north,inner sep=2pt] (t1) at ([yshift=-2.4em]s1.center) {$t_1$:on};
    \node [anchor=north,inner sep=2pt] (t2) at ([yshift=-2.4em]s2.center) {$t_2$:the};
    \node [anchor=north,inner sep=2pt] (t3) at ([yshift=-2.4em]s3.center) {$t_3$:table};
    \node [anchor=east,inner sep=2pt] (t0) at ([xshift=-2.2em]t1.west) {$t_0$};
    }

    {
    \draw [-,dashed,thick] (s3.south) -- (t0);
    \draw [-,dashed,thick] (s3.south) -- (t1);
    \draw [-,dashed,thick] (s3.south) -- (t2);
    \draw [-,dashed,thick] (s3.south) -- (t3);
    }

    \end{tikzpicture}

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


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