\begin{tikzpicture}[>=stealth']
  \node (warmi) at (-1,0) {warmi};
  \node (warmis) at (2,1) {warmis};
  \node (warmikuna) at (2,0) {warmikuna};
  \node (warmiskuna) at (5,1) {warmiskuna};
  \node (warmikunas) at (5,0) {warmikunas};

  \draw[->] (warmi) to node [fill=white] {\scriptsize s} (warmis.west);
  \draw[->] (warmi) to node [fill=white] {\scriptsize kuna} (warmikuna.west);
  \draw[->] (warmis) to node [fill=white] {\scriptsize kuna} (warmiskuna.west);
  \draw[->] (warmikuna) to node [fill=white] {\scriptsize s} (warmikunas.west);
\end{tikzpicture}

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