\begin{tabbing}
(\=(Unfold `guard` 0) \+
\\[0ex]CollapseTHEN (((((((RepeatMFor 2 (D 0)) 
\\[0ex]CollapseTHENM (BoolEval))$\cdot$
\-\\[0ex])\= \+
\\[0ex]CollapseTHENM (AbReduce 0))$\cdot$) 
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 
\-\\[0ex]1:n),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$))$\cdot$
\end{tabbing}