\begin{tabbing}
(\=(BLemma `add\_nat\_wf`) \+
\\[0ex]CollapseTHEN (((BHyp 2) THEN (Auto\_aux (first\_nat 1:n
\-\\[0ex]) ((first\_nat 2:n),(first\_nat 3:n)) (first\_tok :t) inil\_term))))$\cdot$
\end{tabbing}