\begin{tikzpicture}[>=stealth', line width=.15em]
  \node (stem) at (-10,0) {freem};
  \node (stemm) at (-2,0) {bound};
  \node (ndstemm) at (8,4) {nposs};
  \node (nstemm) at (8,-4) {nposs};

  \draw[->] (stem) to node [fill=white] {\footnotesize $m$} (stemm);
  \draw[->] (stemm) to node [fill=white] {\footnotesize $ned$} (ndstemm);
  \draw[->] (stemm) to node [fill=white] {\footnotesize $n$} (nstemm);
\end{tikzpicture}

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