$\forall$$T$:Type, $R$:($T$$\rightarrow$$T$$\rightarrow\mathbb{P}$), $x$, $y$, $z$:$T$. ($x$ ($R$$^{\mbox{\scriptsize $\ast$}}$) $y$) $\Rightarrow$ ($y$ $R$ $z$) $\Rightarrow$ ($x$ $R$\^{}+ $z$)