\begin{tikzpicture}[>=stealth']
  \node at (0,1.5) {Form Entries};
  \node[text width=7em, text ragged] at (5,1.5) {Proto-lexical Mapping};
  \node at (10,1.5) {Lexical Entries};
  
  \matrix[row sep=-\pgflinewidth,
  column sep=-\pgflinewidth,
  column 1/.style={nodes={text depth=0pt,rectangle,draw,text width=12em,text ragged}}] at (0,0)
  {
    \node (ed) {$\left< \mathsf{allpast}, \textsc{dive}, \mathrm{dove} \right>$};   \\
    \node (ed2) {$\left< \mathsf{allpast}, \textsc{dive}, \mathrm{dived} \right>$};   \\
  };


  \matrix[row sep=-\pgflinewidth,
  column sep=-\pgflinewidth,
  column 1/.style={nodes={text depth=0pt,rectangle,draw,text width=17em,text ragged}}] at (10,0)
  {
    \node (e5) {$\left< \lexem{\lambda{s}.s\bullet{dove}}{Nom\multimap{Fin}}{PST(dive)} \right>$};   \\
    \node (e6) {$\left< \lexem{dove}{PRO \multimap{Psp}}{drive} \right>$};                            \\
    \node (e52) {$\left< \lexem{\lambda{s}.s\bullet{dived}}{Nom\multimap{Fin}}{PST(dive)} \right>$};   \\
    \node (e62) {$\left< \lexem{dived}{PRO \multimap{Psp}}{dive} \right>$};                            \\
  };

  \draw[->] (ed) to (e5);
  \draw[->] (ed) to (e6);
  \draw[->] (ed2) to (e52);
  \draw[->] (ed2) to (e62);

  %\draw[->] (simple.east) .. controls +(right:6mm) .. (ded.east);
\end{tikzpicture}

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