\begin{tabbing}
(\=(((((D 0) \+
\\[0ex]CollapseTHENM (BackThruLemma `absval\_eq`))$\cdot$) 
\\[0ex]CollapseTHENM (
\-\\[0ex]U\=nfold `pm\_equal` 0))$\cdot$) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 2:n
\-\\[0ex]),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}