\begin{tabbing}
(\=(Assert $\forall$$m$:$\mathbb{N}^{+}$. (($m$ $\ast$ $a$) = ($m$ $\ast$ $b$)) $\Rightarrow$ ($a$ = $b$)) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n
\-\\[0ex]) ((first\_nat 1:n),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}