\begin{tabbing}
(\=(With $i$ {-} 1 (D ({-}2))) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 2:n
\-\\[0ex]),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}