\begin{tabbing}
(\=(((((Unfolds ``refl sym trans`` 0) \+
\\[0ex]CollapseTHEN (GenUnivCD))$\cdot$) 
\\[0ex]CollapseTHENM (
\-\\[0ex]H\=ypBackchain))$\cdot$) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n),(first\_nat 3:n
\-\\[0ex])) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}