\begin{tabbing}
R{-}size($R$)
\\[0ex]$\,\equiv$$_{\mbox{\scriptsize def}}$$\;\;$es\_realizer\_ind(\=$R$;\+
\\[0ex]1;
\\[0ex]${\it left}$,${\it right}$,${\it rec}_{1}$,${\it rec}_{2}$.(${\it rec}_{1}$ + ${\it rec}_{2}$);
\\[0ex]${\it loc}$,$T$,$x$,$v$.1;
\\[0ex]${\it loc}$,$T$,$x$,$L$.1;
\\[0ex]${\it lnk}$,${\it tag}$,$L$.1;
\\[0ex]${\it loc}$,${\it ds}$,${\it knd}$,$T$,$x$,$f$.1;
\\[0ex]${\it ds}$,${\it knd}$,$T$,$l$,${\it dt}$,$g$.1;
\\[0ex]${\it loc}$,${\it ds}$,$a$,$T$,$P$.1;
\\[0ex]${\it loc}$,$k$,$L$.1;
\\[0ex]${\it loc}$,$k$,$L$.1;
\\[0ex]${\it loc}$,$x$,$L$.1)
\-
\end{tabbing}