\begin{tabbing} $\forall$$T$:(Id$\rightarrow$Type), ${\it tab}$:secret{-}table($T$). \\[0ex]atoms{-}distinct(${\it tab}$) \\[0ex]$\Rightarrow$ (\=$\forall$$x$:Atom1, $n$:$\mathbb{N}$$_{\mbox{\scriptsize $<\parallel$${\it tab}$$\parallel$ }}$.\+ \\[0ex]$n$$\leq$ptr(${\it tab}$) \\[0ex]$\Rightarrow$ st{-}atom(${\it tab}$;$n$) $=$ $x$ \\[0ex]$\Rightarrow$ \=isl(st{-}lookup(${\it tab}$;$x$))\+ \\[0ex]\& outl(st{-}lookup(${\it tab}$;$x$)) $=$ $\langle$key(${\it tab}$;$n$)$,\,$data(${\it tab}$;$n$)$\rangle$ $\in$ ($\mathbb{N}$+Atom1)$\times$data($T$)) \-\- \end{tabbing}