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