\begin{tabbing} (\=(((((Unfolds ``identity compose`` 0) \+ \\[0ex]CollapseTHEN (UnivCD))$\cdot$) \\[0ex]CollapseTHENM (Reduce 0 \-\\[0ex])\=)$\cdot$) \+ \\[0ex]CollapseTHENA ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n),(first\_nat 3:n \-\\[0ex])) (first\_tok :t) inil\_term)))$\cdot$ \end{tabbing}