\begin{tikzpicture}
  \node (NP) at (0,0) {$NP$};
  \node (PRO) at (0,-2) {$PRO$};
  \node (It) at (0,-4) {$It$};
  \node (Neu) at (0,-6) {$Neu$};
  \node (NOM) at (-2,-2) {$NOM$};
  \node (ACC) at (2,-2) {$ACC$};
  \node (Nom) at (-2,-4) {$Nom$};
  \node (Acc) at (2,-4) {$Acc$};
  \draw [->] (NP) to (NOM);
  \draw [->] (NP) to (PRO);
  \draw [->] (NP) to (ACC);
  \draw [->] (NOM) to (Nom);
  \draw [->] (NOM) to (It);
  \draw [->] (ACC) to (Acc);
  \draw [->] (ACC) to (It);
  \draw [->] (PRO) to (Nom);
  \draw [->] (PRO) to (Acc);
  \draw [->] (Nom) to (Neu);
  \draw [->] (Acc) to (Neu);
\end{tikzpicture}

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