\begin{tabbing}
(\=(Assert ((($n$ {-} 1) $\ast$ $a$)+$a$) $\leq$ ((($n$ {-} 1) $\ast$ $b$)+$b$)) \+
\\[0ex]CollapseTHENM ((Auto\_aux (first\_nat 1:n) ((first\_nat 2:n),(first\_nat 
\-\\[0ex]3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}