\begin{tabbing} (\=(((With $n$ (D ({-}3))) \+ \\[0ex]CollapseTHENM (D ({-}1)))$\cdot$) \\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n \-\\[0ex]) ((first\_nat 1:n),(first\_nat 4:n)) (first\_tok :t) inil\_term)))$\cdot$ \end{tabbing}