\begin{tabbing}
(\=(((Unfolds ``l\_before guard`` 0) \+
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 
\-\\[0ex]1\=:n),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$) \+
\\[0ex]CollapseTHEN (Using [`L2',$L_{1}$] Easy))
\-\\[0ex]$\cdot$
\end{tabbing}