\begin{tabbing}
(\=(((Repeat (Unfolds ``iff rev\_implies`` 0)) \+
\\[0ex]CollapseTHEN (
\-\\[0ex]B\=ackchain ``sq\_stable\_\_and sq\_stable\_\_implies``))$\cdot$) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 
\-\\[0ex]1:n) ((first\_nat 1:n),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}