\begin{tabbing}
(\=(Subst' (($n$+$m$) {-} 1) = ($n$ {-} 1)+$m$ 0) \+
\\[0ex]CollapseTHENA ((Auto\_aux (first\_nat 1:n
\-\\[0ex]) ((first\_nat 1:n),(first\_nat 1000:n)) (first\_tok SupInf:t) inil\_term)))$\cdot$
\end{tabbing}