\begin{tabbing}
(\=(((NotThinning (With $a_{1}$ (EqHD 5))) \+
\\[0ex]CollapseTHENM (With $a_{2}$ (EqHD 5)))$\cdot$) 
\\[0ex]
\\[0ex]CollapseTHENA ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n),(first\_nat 4:n)) (first\_tok :t
\-\\[0ex]) inil\_term)))$\cdot$
\end{tabbing}