\begin{tikzpicture}[>=stealth',line width=.15em]
  \node (long) at (0,0) {\sf\mixone{Long}};
  \node (short) at (10,0) {\sf\mixtwo{Short}};
  \node (both) at (5,-4) {\alpha};
  \node (table) at (17,-2) {
    \begin{tabular}{l}
      $\vdash \alpha \leq \textsf{Long}$ \\
      $\vdash \alpha \leq \textsf{Short}$ \\
    \end{tabular}
  };

  \draw[->] (both.north) to (long);
  \draw[->] (both.north) to (short);
\end{tikzpicture}

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