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