\begin{tabbing}
(\=(if (((first\_nat 2:n)) = 0) then (Repeat ((D (0)$\cdot$) \+
\\[0ex]CollapseTHENA (Auto$\cdot$)$\cdot$
\-\\[0ex])\=) else (RepeatFor (first\_nat 2:n) ((D (0)$\cdot$) \+
\\[0ex]CollapseTHENA (Auto$\cdot$)$\cdot$)))$\cdot$) 
\\[0ex]
\\[0ex]CollapseTHEN ((Unfold `guard` ( 0)$\cdot$) 
\\[0ex]CollapseTHEN ((AutoBoolCase $a$) 
\\[0ex]CollapseTHEN (
\-\\[0ex]AutoBoolCase $b$)$\cdot$)$\cdot$)$\cdot$
\end{tabbing}