\begin{tabbing}
(\=(With $\lambda$$i$,$j$. True MemCD) \+
\\[0ex]CollapseTHEN (Try (((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n
\-\\[0ex])\=,(first\_nat 3:n)) (first\_tok :t) inil\_term)) \+
\\[0ex]CollapseTHEN (Fail))$\cdot$))$\cdot$
\-
\end{tabbing}