\begin{tabbing}
((((((InstLemma `append\_overlapping\_sublists`  
\\[0ex][\=$T$;[$x$];[$x$];$l$;$y$]) \+
\\[0ex]CollapseTHEN (
\-\\[0ex](\=Auto\_aux (first\_nat 1:n) ((first\_nat 1:n),(first\_nat 3:n)) (first\_tok :t) inil\_term)))$\cdot$)\+
\\[0ex]
\\[0ex]CollapseTHEN (All Reduce))$\cdot$) 
\\[0ex]CollapseTHEN ((Auto\_aux (first\_nat 1:n) ((first\_nat 1:n
\-\\[0ex]),(first\_nat 4:n)) (first\_tok :t) inil\_term)))$\cdot$
\end{tabbing}