\begin{tikzpicture}[>=stealth']
  \matrix[column 1/.style={nodes={text width=9em,text ragged}}] at (-3.5,-1)
  {
    \node {$\mathsf{derived}\leq \mathsf{prefixable}$}; \\
    \node {$\mathsf{ready}\leq \mathsf{prefixable}$}; \\
  };

  \node (bse) at (0,1) {$\sformt{ready}{tekobejegen}$};
  \node (s) at (4,-2) {$\sformt{derived}{tekobejegen\red{m}}$};
  \node (ed) at (0,-5) {$\sformt{one}{{\red{n}}tekobejegen}$};
  \node (ing) at (4,-5) {$\sformt{one}{{\red{n}}tekobejegen\red{m}}$};

  \draw[->] (bse) to node[fill=white] {\scriptsize $p_1(s\leq{ready})$} (s);
  \draw[->] (bse) to node[fill=white] {\scriptsize $p_2(s\leq{prefixable})$} (ed);
  \draw[->] (s) to node[fill=white] {\scriptsize $p_2(s\leq{prefixable})$} (ing);
\end{tikzpicture}

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