\begin{tabbing}
((\% Switch quantification to T \% 
\\[0ex]A\=ssert $\forall$$x$:$T$, $y$:$S$. ($f$($y$) = $x$) $\Rightarrow$ $P$($y$)) \+
\\[0ex]CollapseTHEN (
\-\\[0ex]I\=f\=LabL \+\+
\\[0ex][`assertion`,((D 0) 
\-\\[0ex]CollapseTHENA ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n
\-\\[0ex])\=,\=(first\_nat 4:n)) (first\_tok :t) inil\_term)))$\cdot$ \+\+
\\[0ex];`main`,((InstHyp [$f$($n$);$n$] ({-}1)) 
\\[0ex]
\-\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n),(first\_nat 3:n)) (first\_tok :t
\-\\[0ex]) inil\_term)))$\cdot$]))$\cdot$
\end{tabbing}