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