\begin{tikzpicture}[>=stealth']
  \node (ded) at (0,0) {$\mathsf{beat}$};
  \node (ened) at (2,0) {$\mathsf{beaten}$};
  \node (dened) at (1,-2) {$\mathsf{slept}$};

  \draw[-] (ded) to (dened);
  \draw[-] (ened) to (dened);
\end{tikzpicture}

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