\begin{tabbing}
(\=(((((BoolCasesOnCExp 0 $\leq$z $x$) \+
\\[0ex]CollapseTHENM (BoolCasesOnCExp 0 $\leq$z $y$))$\cdot$) 
\\[0ex]
\\[0ex]CollapseTHENM (AbReduce 0))$\cdot$) 
\\[0ex]CollapseTHENA ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n
\-\\[0ex]),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}